Taking into account the local weather in Sunshine Valley is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 60°F, while the coldest months are February and December with an average of 31°F. The rainiest months in Sunshine Valley are November, January, December, and March, with each month seeing an average of 13 inches of rainfall.