Harry Potter and the Prisoner of Azkaban - My personal favorite in the series about everyone's favorite boy wizard. Expecto Patronum! Stag/deer also very fall-ish critter in the south.
The Watcher In The Woods - Ah, fall leaves, let's go view some in the woods, *plays song:* "I always feel like somebody's is watching me." No, seriously, nowadays the book has a very retro 70s feel, reminding me of simpler times and the fall season of my childhood.
Dracula - The vampire book that really started it all, other fun reads, my fav Halloween costume & decor. Oh, and arguably the best classic monster movie.
Hatchet - Book memories of reading this one fall for a middle school Lit class. The great and wild outdoors and the wilderness expert who lectured us on real life survival.
Sign of the Beaver - Ditto, for this middle school read. I'll always remember the main character describing his clothing as thin as a book page (and it was cold). There's a connection about the outdoors and fall in my mind.
New Moon - This one's mostly book memories of reading this in the fall. Also, the Northwest coast setting seems like it would be crisp and cool and perfect for a fall coat (so different from here!).
A New Coat for Anna - Winter's coming! Wait, wrong catch phrase. Anyways, this is an adorable picture book from my childhood, about acquiring a new coat.
October Country by Ray Bradbury - The title says it all, plus ghost stories!
Howl's Moving Castle - Another magical wizard read. Spells/curses and mentions of bacon.
Tenchi! Muyo! manga series - School memories and the use of bright fall colors.