May in Tver is the rainiest month of the year. In May, the weather in Tver is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Tver has 18 rainy, 9 sunny, and 4 partly cloudy days in May. The rains are usually moderate. May as well as March, April, September, and October is considered the most uncomfortable time to visit Tver.