April in Vilnius is the sunniest month of the year. In April, the weather in Vilnius is typically warm. Average daily high temperature in April is about 11 degrees above zero. On average, Vilnius has 9 rainy, 9 sunny, 8 partly cloudy, and 4 cloudy days in April. The rains are usually moderate. April as well as February, March, October, and November is considered the most uncomfortable time to visit Vilnius.