It is also the highest-use month, because so many find it is the best time for them. The permit restrictions do keep use to an acceptable level for most people, and there are always places that you can get away and be alone. Toward the end of the month, things do slow considerably. There is a meteor shower each year around August 11, which is easily seen in the clear night air. This is the beginning of fall, and everything in canoe country slows down and prepares for winter.
Nights get cool to around freezing as the month goes by.
Daytime temperatures drop from around 70 to 40. It is a low-use time and a time when larger groups are not around. Animals move more and are seen more often. Moose are seen often in September and can even be called. Leaves begin to change toward the end of the month with the peak just at season's end.