Below are the Weirs Beach Water Temperature charts during the summer and fall of 2019. While water temperature can vary somewhat from season to season, these charts give a good insight into what to expect

The charts start at the summer solstice, when the water temperature has reached the mid-60°s, still uncomfortably chilly for most people. By the July 4th holiday, temperatures have reached the lower 70°s, still on the cool side for swimming, but tolerable. By mid-July, water temperatures reach the middle 70°s, now comfortable for most people. The water reaches its peak temperature just short of 80° near the 1st of August. Temperatures then begin a gradual decline, to the low 70°s by the end of August, and below 70° on September 7. Temperatures stabilize in the upper 60°s until the end of September, then plunge rapidly from that point, cooling to the upper 50s by mid-October. By November 1st, temperatures are in the lower 50°s.