May in Stirling is the sunniest month of the year. In May, the weather in Stirling is typically warm. Average daily high temperature in May is about 12 degrees above zero. On average, Stirling has 18 rainy, 6 sunny, 4 cloudy, and 3 partly cloudy days in May. The rains are usually moderate. May as well as January, February, March, and April is considered the most uncomfortable time to visit Stirling.