Looking to catch a big bass on a hot summer day? Knowing how fish move, based on water temperature, is what separates the pros from the amateurs. The hotter it is outside, the more aggressive the fish are going to become. They burn more energy, and in turn they must feed more often. Look to the shallows, as fish often feed near the shade when it's excessively hot. It pays dividends to struggle a bit by fishing heavy weeds, heavy timber and around docks and piers. Bass are often lurking nearby, waiting for a bite to eat.