In April, the weather in Wunnummin Lake is typically cold. Average daily high temperature in April is about 1 degree above zero. On average, Wunnummin Lake has 19 cloudy, 5 rainy, 3 snowy, and 3 sunny days in April. The rains are usually moderate. April as well as January, February, May, and October is considered the most uncomfortable time to visit Wunnummin Lake.