When water temperatures warm to the point that river and stream fishing slows down, surface activity on lakes and ponds only occurs right before dark or first thing in the morning, and stripers start moving out from tidal rivers to deeper in Casco Bay, it is time to change fly-fishing locales. or species. While I have been prioritizing stripers, they are disappearing from near shore haunts as the water warms with the warm humid nights that we have had.
People have the false perception that it is the hot days that warm the water. More often, it is when the nights stay warm and humid, and prevent waters from cooling, that create the largest upswing in water temperatures.
When larger waters warm above 68 degrees, I sometimes move to small mountain streams that stay cold all summer. Wading wet, even if the day is a scorcher, can mean numb feet after awhile.
Small stream summer fishing means a 3-weight (or smaller) rod, a handful of flies, wet wading, and lower expectations. The native and wild trout, and even the educated stockers are easily spooked and won’t be must larger than hand-sized.
But I love the carved granite plunge pools of New England; no two are ever exactly alike, and the quicksilver trout can appear as if from nowhere in liquid-crystal pools to grab my offering.