The Upstate has all four seasons, but winter is pretty mild and short. Average highs range from 52oâ€‹ F. in January to 90o F. in July. And average lows range from 30o F. in January to 68o F. in July. But, typically our location in the middle of Lake Keowee helps moderate both the highs and the lows. Annual precipitation averages about 50 inches; with a fairly narrow range (3.6 inches in April/May to 4.8 inches in Dec-Feb.). Click here for today's weather in Seneca.