When you're dreaming of a escape to Nyanza-Lac, year-round temperatures and rainfall may be important factors to consider. The hottest months are usually September and August with an average temp of 77°F, while the coldest months are July and January with an average of 74°F. The rainiest months in Nyanza-Lac are April, December, March, and November, with each month seeing an average of 13 inches of rainfall.