Headlining the update are Halloween-themed activities including growing pumpkins which can be used for DIY projects. Players will also be able to buy costumes such as a mage dress and a mummy outfit, and exchange Nook Miles for body paint and coloured eye contacts.
On Halloween night on October 31, players will be able to unlock spooky in-game rewards by giving lollipops and candy to island visitor Jack.
And a new Dreaming Favourite List will enable players to curate a list of their top islands to visit in dreams.
Nintendo of America has also confirmed that the Nintendo Switch Animal Crossing: New Horizons console will be available again at participating retailers for $299.99.
The next Animal Crossing: New Horizons update after the fall one will be available in late November.
Animal Crossing: New Horizons released on March 20, 2020 and had sold some 22.4 million units as of June 30, making it the second best-selling Switch game to date behind April 2017 release Mario Kart 8 Deluxe, which had sold 26.74 million copies.