10 Most Anticipated Science Fiction and Fantasy Books Coming Out in September 2026
- Joao Nsita
- 2 hours ago
- 16 min read
Finding the best new science fiction and fantasy books can become a full-time job when publishers keep dropping exciting releases faster than you can clear your TBR. September 2026 is about to make that problem considerably worse, with dragons, gothic kingdoms, pirates, vampires, fallen angels, fractured timelines, Star Wars rebels and one extremely angry wolf all competing for your attention.
This is one of those months where fantasy readers may want to accept defeat and simply buy a bigger bookshelf. Some of the biggest fantasy authors working today are returning, including Rachel Gillig, Leigh Bardugo, Rebecca Yarros, Victoria Aveyard, Stephanie Garber, Adalyn Grace and T. Kingfisher. On the science fiction side, Emily St. John Mandel returns with another ambitious speculative novel, while Rebecca Roanhorse heads back into the Star Wars universe with a story set during the rise of the Empire.
The range is particularly good. If your idea of the perfect September read involves gothic fantasy, dangerous romance and a kingdom full of secrets, The Knave and the Moon looks almost designed for autumn reading. If you prefer dark academia books and supernatural horror, Leigh Bardugo is finally bringing the Ninth House trilogy to its conclusion with Dead Beat. If dragons are the reason your bank account keeps suffering, Rebecca Yarros is returning to the Fourth Wing universe with Threshing Day.
There are also several new fantasy books here that could launch major obsessions. Victoria Aveyard is beginning a pirate fantasy series with Tempest, while Adalyn Grace makes her adult fantasy debut with The Wretched Divine. T. Kingfisher writing an official Baldur's Gate 3 novel centred on Astarion sounds like somebody looked at what fantasy readers were discussing online and decided to create the most dangerous possible combination.
Science fiction readers aren't being forgotten either. Emily St. John Mandel's Exit Party moves through fractured timelines, a future America, surveillance and political collapse, while Rebecca Roanhorse's Star Wars: Edge of the Abyss expands the Reign of the Empire series. These aren't simply new books with familiar authors attached; several are major sequels, conclusions, companion stories or launches that could dominate fantasy book recommendations throughout autumn 2026.
So, if you're looking for the most anticipated fantasy books of September 2026, the biggest new science fiction books, the latest romantasy releases, dark fantasy books, BookTok fantasy recommendations or simply ten excellent reasons to destroy your carefully planned September reading schedule, you're in the right place.
Here are the 10 most anticipated science fiction and fantasy books coming out in September 2026. Let's start 👇
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Release date: September 1, 2026
Waiting more than a decade for Scott Hawkins to follow The Library at Mount Char has given Blacktail the sort of curiosity factor most second novels can only dream about. Hawkins isn't returning with a safe imitation of his cult favourite either; he's giving us a violent dark fantasy told around a wolf whose grief gradually becomes something much bigger and considerably more dangerous. Penguin Random House confirms Blacktail as Hawkins' long-awaited second novel and a September 1 release. Penguin Random House
Blacktail is a wolf living in a world increasingly threatened by humanity. After his mate is killed, his grief turns into revenge, attracting the attention of an ancient feline witch who presents him with a rather extreme solution: instead of punishing a handful of humans, why not help destroy humanity altogether? Blacktail consequently sets out to awaken the Forest God, believing that this ancient power may be able to stop humanity's destruction of his world.
I love how strange this sounds. Fantasy shelves aren't exactly short of chosen warriors, assassins and reluctant princes, so making an actual wolf the centre of an epic revenge fantasy immediately gives Blacktail its own identity. Hawkins also appears to be using that premise to explore environmental destruction, faith, grief and the uneasy relationship between humans and the natural world.
This is probably the biggest wildcard among September 2026 fantasy releases. Readers looking for cosy fantasy should run in the opposite direction, but fans of dark fantasy, folk horror, weird fiction and brutal speculative fiction should put Blacktail very high on their autumn reading list.
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Release date: September 2026
A new Rebecca Roanhorse novel would already be worth watching, but putting her inside the political pressure cooker of the Andor era makes Star Wars: Edge of the Abyss considerably more interesting. The novel is the second instalment of the Reign of the Empire trilogy, following Alexander Freed's The Mask of Fear. Penguin's autumn catalogue confirms the September release and places the story thirteen years after the previous novel. wp.penguin.co.uk
Bail Organa, Mon Mothma and Saw Gerrera remain caught beneath the Empire's increasingly suffocating control of the galaxy. That immediately puts Edge of the Abyss into one of the richest periods of modern Star Wars storytelling, when rebellion is still fragmented and resistance carries enormous personal consequences. If you loved the politics, moral compromises and slow construction of rebellion in Andor, this is the September science fiction release to investigate.
Roanhorse is an especially intriguing author for this material because character, power and identity have always mattered in her speculative fiction. This isn't the Star Wars novel I'm anticipating because I want lightsaber battles every twenty pages. I want to see what she does with people trying to resist an enormous political machine while disagreeing about what resistance should actually look like.
It also prevents this list from becoming ten fantasy novels pretending to be a science fiction and fantasy roundup. Space-opera readers deserve something too.
Release date: September 29, 2026
Someone apparently decided that fantasy readers weren't sufficiently distracted already and combined Astarion, Baldur's Gate 3 and T. Kingfisher. The resulting novel is an official dark fantasy adventure set before the events of the game, with Random House Worlds confirming its September 29 release. Penguin Random House
Astarion Ancunin hasn't yet become the character players encounter in Baldur's Gate 3. He's trapped as vampire lord Cazador Szarr's spawn and desperate to find a way out of centuries of servitude. When Cazador announces a competition and the blood of a dead god becomes a potential prize, Astarion forms an unlikely alliance with Aasimar paladin Hahn den Suriel, creating an opportunity to disobey his master and perhaps finally change his fate.
This could easily have been straightforward franchise merchandise, but Kingfisher's involvement changes my expectations considerably. Astarion is funny, seductive, damaged, selfish, frightening and deeply vulnerable, which is exactly the sort of contradictory character who can sustain a much richer fantasy novel than a simple game tie-in.
The romantic element also sounds significant, giving romantasy readers another reason to pay attention. For gamers wondering what fantasy book to read in September 2026, this is probably the easiest recommendation on the entire list.
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Release date: September 22, 2026
Jacks and Evangeline are back, which means a very large section of the romantasy community can officially cancel whatever they were planning on September 22. The Mirror of Infinite Endings is an illustrated companion to Stephanie Garber's bestselling Once Upon a Broken Heart series, returning readers to the Magnificent North after Jacks and Evangeline finally found their happily ever after. Macmillan
Naturally, everything is completely fine. Nobody is keeping a dangerous secret, reality isn't in danger of being rewritten, and there is absolutely no reason to distrust that suspiciously perfect happy ending. If you've read Garber before, you already know you should believe approximately none of that.
The book features fan-favourite characters and more than twenty full-page illustrations, making it feel as much like a celebration of the series as a continuation. That distinction matters: readers shouldn't go into this expecting a conventional full-length fourth novel. Instead, it looks like a beautifully packaged return to characters and a fantasy world people weren't quite ready to leave.
September is becoming an unusually strong month for romantasy books, and this might be its easiest comfort pick. Readers who love fairy-tale fantasy, magical romance, whimsical worlds and Jacks' particular brand of chaos already know why this belongs on the TBR.
Release date: September 22, 2026
Adalyn Grace moving into adult fantasy with angels, demons, forbidden alliances and dangerous magical bonds feels like a very efficient way of attracting romantasy readers. The Wretched Divine begins a new fantasy world centred on Aurelie Chantelune, a knight raised to fight the demons ravaging her kingdom. It is Grace's adult debut and arrives September 22. Apple
Aurelie has spent her life preparing to kill demons after losing her family to them. Her first kill should allow her to inherit her family's soulbond with the angel Yuriel, giving her power that could help protect the kingdom. Things become much messier when people she loves begin transforming into the monsters she has been trained to destroy, eventually forcing her into another bond with Severin, a demon who claims there may be a way to end the war.
That's an excellent fantasy setup because it attacks Aurelie's certainty from every direction. The enemy she's been taught to hate may understand the conflict better than she does, while the institutions and beliefs that shaped her identity suddenly become things she has to question.
Readers looking for new romantasy books, angel fantasy, demon romance, epic fantasy or morally complicated fantasy relationships should have this circled. If Grace gets the emotional conflict right, The Wretched Divine could become much more than another angels-versus-demons story.
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Release date: September 29, 2026
No September fantasy books list would look particularly convincing without Rebecca Yarros somewhere near the top. Threshing Day returns to the Empyrean world of Fourth Wing, but there's an important distinction for readers to understand: this isn't Empyrean Book Four. It's a collection of thirteen stories featuring familiar characters and dragons. Hachette UK
That may actually be part of the appeal. Basgiath War College has become one of modern romantasy's most recognisable settings, and shorter stories offer Yarros an opportunity to explore characters and moments that couldn't necessarily carry a full novel. The edition is being treated as a major event too, with the limited deluxe first printing featuring sixteen original full-colour illustrations.
The enormous Fourth Wing readership means this will inevitably be one of the most talked-about fantasy books of September 2026. Dragon fantasy, military fantasy and fantasy romance remain extraordinarily popular combinations, and Threshing Day gets to play inside a world where readers already have strong attachments.
I'm keeping it at No. 5 because a story collection isn't quite as exciting to me as the next full Empyrean novel. For devoted fans, though, that distinction may be completely irrelevant. Tell them there are thirteen new Empyrean stories and watch their pre-order finger do the rest.
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Release date: September 8, 2026
Pirates, war, lost love, a brutal empire and Victoria Aveyard launching an entirely new fantasy world? Tempest has my attention before we've even left the harbour. The Red Queen author begins The Lyrian Sea with a sweeping pirate fantasy centred on Cat Rose, and Aveyard's official site confirms its September 8 release. Victoria Aveyard
Cat has already lived two very different lives: once as Lady Catrine Rose of the Meridian Empire and now as the Widow Rose, running a pirate tavern in the Lyrian Sea. When the Meridian Empire moves to crush the pirate republic, the legendary pirate Valerian Kane becomes crucial to the resistance. Unfortunately for Cat, he's also the man she once loved, and the Empire gives her a brutal choice: deliver Valerian or hang.
That's exactly the kind of romantic fantasy conflict I want because the relationship isn't floating separately from the larger story. Cat's feelings, survival and political loyalties are all pulling against one another, meaning romance and war can genuinely affect the same decisions.
Fantasy readers searching for pirate books after The Adventures of Amina al-Sirafi, high-seas fantasy, enemies and lovers caught on opposing sides, epic fantasy adventure or new romantasy releases should watch this closely. At nearly 500 pages, it also sounds substantial enough to make the Lyrian Sea feel like somewhere worth getting lost.
Release date: September 2026
If your science fiction preferences lean towards Station Eleven rather than spaceships firing lasers at one another, Exit Party is probably your September event. Emily St. John Mandel returns with another speculative novel built around fractured timelines, shadow worlds, political collapse and the strange connections between people living through enormous historical change. North American listings place publication on September 15, while Pan Macmillan's UK edition is dated September 17, so readers should check their local edition. Google Play
The story begins in Los Angeles in 2031, after the collapse of the United States. A man disappears from a party, sending the narrative outward through a future shaped by civil war, surveillance and instability. The novel's scope stretches from Los Angeles to Greece, Paris and even a colony on the moon, while doubles and parallel realities complicate what initially looks like a disappearance.
Mandel is particularly good at making huge speculative ideas feel strangely intimate. Station Eleven wasn't memorable simply because civilisation collapsed, and Sea of Tranquility wasn't compelling simply because it played with time. Her stories work because ordinary human connections remain important even when reality itself becomes unstable.
For readers searching for literary science fiction books, dystopian novels, speculative fiction, parallel timeline stories and the best new sci-fi books of 2026, this is essential September reading.
Release date: September 15, 2026
There are ordinary sequels, and then there are books that have several years of reader anxiety piled on top of them. Dead Beat belongs firmly in the second category. Leigh Bardugo's third Ninth House novel is officially the final book in the trilogy, bringing Alex Stern's supernatural Yale story to its conclusion on September 15. Gollancz
Alex has been to hell and returned, but the consequences have followed her home. Demons are moving through New Haven and Yale, feeding on the living and terrorising the dead, while the threat of the underworld opening becomes increasingly serious. Alex, Dawes, Turner, Mercy, Tripp and Darlington are pulled into the conflict as the secrets surrounding Yale's societies and Alex's own blood become increasingly important.
This series has always worked best when Bardugo makes Yale itself feel dangerous. Privilege, secret societies, violence, ambition and literal supernatural power sit uncomfortably beside one another, giving the books an identity that goes beyond simply being dark academia with ghosts.
The finale also has the advantage of bringing relationships readers have followed for two books to their breaking point. Alex and Darlington alone should generate enough discussion to keep BookTok busy for weeks. For dark academia fans, supernatural thriller readers and anyone who likes fantasy with horror running through its veins, Dead Beat is one of September's essential releases.
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🎧 Before we reveal the No. 1 book, discover original romantic audio dramas, comedies and character-driven stories from That Love Podcast.
Release date: September 1, 2026
Rachel Gillig gets the No. 1 spot because The Knave and the Moon has almost everything that makes a fantasy release dangerous to my reading schedule: an established world, gothic atmosphere, romantic longing, political power, mysteries and characters entering the story in considerably worse circumstances than I'd like for them. The sequel to The Knight and the Moth returns to the Stonewater Kingdom on September 1. Hachette UK
Aisling Cathedral lies in ruins, several characters are rumoured dead, and Sybil Delling has been taken as King Benji's bride. Benji plans tournaments across Traum to strengthen his position, while Sybil remains determined to bring him down. Then a mysterious knave with neither name nor memory begins rising through those tournaments, potentially giving Sybil the opportunity she needs to attack the foundations of Benji's power.
That premise sounds wonderfully gothic without simply repeating the previous book. Gillig has moved the pieces, changed the balance of power and introduced a mystery that can pull both the romance and fantasy plot forward.
This is also almost offensively well timed. A gothic romantasy arriving on September 1, just as readers start searching for atmospheric autumn books, dark fantasy romance and cosy-season TBR recommendations, feels like publishing strategy performed with surgical precision.
If you loved The Knight and the Moth, this is the obvious priority. If you haven't read it yet, September gives you an excellent excuse to catch up before returning to Stonewater.
Why September 2026 Is Such a Strong Month for Fantasy and Science Fiction
What makes this month's release calendar exciting isn't simply the number of recognisable authors. The books themselves represent how broad science fiction and fantasy reading has become. You can move from gothic romantasy to literary dystopian science fiction, then jump into dark academia, pirate fantasy, Star Wars space opera, gaming fantasy and a bloody eco-fantasy narrated around a wolf.
Romantasy remains impossible to ignore. The Knave and the Moon, The Wretched Divine, Tempest, Threshing Day and The Mirror of Infinite Endings all contain some combination of romance and fantasy, but they aren't telling the same story. That's encouraging at a point when popular fantasy tropes can occasionally make new releases feel suspiciously interchangeable.
The science fiction selections provide a useful contrast. Exit Party is interested in fractured societies, surveillance and parallel realities, while Edge of the Abyss explores resistance beneath an authoritarian galactic empire. Both show how speculative fiction can take enormous concepts and use them to examine people making difficult decisions.
September 2026 isn't asking you to choose between science fiction and fantasy. It's asking how much shelf space you have left.
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Conclusion
September 2026 looks like one of those months where every corner of speculative fiction has decided to show up at once. Readers who want huge established worlds have Threshing Day, Dead Beat and The Mirror of Infinite Endings, while anyone desperate to begin something new can sail into Victoria Aveyard's Tempest or enter Adalyn Grace's angel-and-demon conflict in The Wretched Divine.
Science fiction readers should make room for Exit Party, particularly if you enjoy speculative fiction that uses the future to make the present feel slightly more uncomfortable. Star Wars: Edge of the Abyss gives space-opera readers something substantial too, while Blacktail looks ready to satisfy anyone who wants their autumn fantasy bloody, strange and considerably less predictable.
My biggest curiosity might be Baldur's Gate 3: Astarion. Astarion is already a character with enough contradictions to fill a novel, and T. Kingfisher is exactly the kind of writer who could make an official gaming tie-in feel like a genuine fantasy event rather than an extended piece of merchandise.
But The Knave and the Moon takes the top position because its combination of gothic fantasy, romance, mystery and an already-loved world feels perfectly suited to September. Dead Beat is extremely close behind, especially because Bardugo is closing the book on Alex Stern's Ninth House trilogy.
Whichever direction you go, September's fantasy and science fiction releases aren't going to help your TBR become more manageable. Frankly, I think we stopped pretending that was the goal several books ago.
Which September 2026 book are you most excited to read, and which title would you put at No. 1?
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10 FAQs About September 2026 Science Fiction and Fantasy Books
1. What are the most anticipated fantasy books coming out in September 2026?
September's major fantasy releases include Rachel Gillig's The Knave and the Moon, Leigh Bardugo's Dead Beat, Victoria Aveyard's Tempest, Rebecca Yarros' Threshing Day, Adalyn Grace's The Wretched Divine and Stephanie Garber's The Mirror of Infinite Endings. The month covers gothic fantasy, romantasy, dark academia, pirate fantasy, dragon fantasy and dark fantasy.
2. What new science fiction books are coming out in September 2026?
Emily St. John Mandel's Exit Party is one of September's biggest literary science fiction releases, combining dystopian fiction, fractured timelines and alternate realities. Rebecca Roanhorse's Star Wars: Edge of the Abyss adds a major space-opera release to the month, expanding the Reign of the Empire trilogy during the period leading towards Andor. Pan Macmillan
3. When does The Knave and the Moon come out?
Rachel Gillig's The Knave and the Moon releases on September 1, 2026. It is the sequel to The Knight and the Moth and returns readers to the Stonewater Kingdom, with Sybil facing King Benji while a mysterious nameless knave rises through his tournaments. Hachette UK
4. Is Dead Beat the final Ninth House book?
Yes. Dead Beat is being published as the third and final novel in Leigh Bardugo's Ninth House trilogy. It releases September 15, 2026 and brings Alex Stern, Darlington and the supernatural secrets surrounding Yale back for the conclusion. Gollancz
5. Is Threshing Day Fourth Wing Book 4?
No. Threshing Day is not Empyrean Book Four. It is a collection containing thirteen stories from the Empyrean universe featuring familiar characters and dragons, with the first deluxe edition also including sixteen full-colour illustrations. It releases September 29, 2026. Hachette UK
6. What is Victoria Aveyard's Tempest about?
Tempest begins Victoria Aveyard's new Lyrian Sea fantasy world and follows Cat Rose as an empire threatens a pirate republic. The legendary Valerian Kane may be crucial to resisting that empire, but he's also someone Cat once loved, placing romance, survival and political loyalty in direct conflict. The book releases September 8, 2026. Victoria Aveyard
7. Is there a Baldur's Gate 3 Astarion novel?
Yes. T. Kingfisher has written Baldur's Gate 3: Astarion, an official novel centred on Astarion Ancunin before the events players know from the game. It explores his existence under Cazador Szarr and an unlikely alliance involving Aasimar paladin Hahn den Suriel. Random House Worlds publishes the 272-page novel on September 29, 2026. Penguin Random House
8. Is The Mirror of Infinite Endings a full Once Upon a Broken Heart sequel?
It's being presented as an illustrated Once Upon a Broken Heart companion, rather than simply another conventional full-length novel in the original trilogy. The 256-page release returns to Jacks and Evangeline and includes more than twenty full-page illustrations alongside appearances from familiar characters. It arrives September 22, 2026. Macmillan
9. Which September 2026 fantasy books are romantasy?
Several major releases combine fantasy and romance. The Knave and the Moon, Tempest, The Wretched Divine, Threshing Day and The Mirror of Infinite Endings should particularly appeal to romantasy readers, although the balance between romance and the larger fantasy story varies considerably between titles.
10. What fantasy book should I read in September 2026?
That depends on your preferred fantasy subgenre. Try The Knave and the Moon for gothic romantasy, Dead Beat for dark academia and supernatural horror, Tempest for pirates and epic adventure, The Wretched Divine for angels and demons, or Blacktail when you want something darker, stranger and much less conventional.
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