Taking the local weather in South Cle Elum into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 16°C, while the coldest months are December and January, with an average of -3°C. The snowiest months in South Cle Elum are January, December, February and March, with each month seeing an average of 17 cm of snowfall.