May in White Bear Lake is the rainiest month of the year. In May, the weather in White Bear Lake is typically warm. Average daily high temperature in May is about 18 degrees above zero. On average, White Bear Lake has 16 rainy, 8 sunny, 4 partly cloudy, and 3 cloudy days in May. The rains are usually heavy. May as well as January, March, April, and November is considered the most uncomfortable time to visit White Bear Lake.