BINGO. Snakes notice these things & heed their survival instincts. I'd wait at least a week to 10 days before offering food again- give him time to accept the "weather" is reliable. I'd try increasing the day length if you can, also, to help assure your success- by running a daylight bulb in the same room as he is (not directly over his enclosure). Having the days get shorter at the same time our snakes feel a "chill" in the air is what can make them go off eating.
In the event you cannot talk him into eating again, then you'll have to reduce his temperatures (gradually- over 2+ weeks) & brumate him, hoping he does okay over the winter. But first I'd try to get him eating again if that was my snake. IF you end up brumating him, keep in mind he still needs a bowl of fresh water along with a cool dark place to snooze- they don't sleep super-soundly & do drink now & then, or should. Brumation temperatures should remain about 50-57*.
Brumation is only needed for fertility if reproduction is the goal, or to lower a snake's metabolism so they don't starve- it does carry some risks to the health of the snake, because their immune system is not functioning like when they're warm & awake. If a snake shows ANY signs of health issues, best not to brumate.