In most of the country, a September afternoon can reach the same sweltering temperatures that you fought in August with a dip in the pool. Lengthening nights, however, can make smallmouth fishing excellent after sundown. In summer, the water had less time to cool off between UV beatings, and moving-water bass favored hatching insects or smaller baitfish. Now, big bronzebacks may be sluggish at midday, but the evening relief will get them on the hunt. They can feel autumn coming, and when they prowl after dark, they’re often looking for a real meal.