In April, the weather in Friedrichshafen is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Friedrichshafen has 15 rainy, 8 sunny, 6 partly cloudy, and 1 cloudy day in April. The rains are usually moderate. April as well as January, February, March, and November is considered the most uncomfortable time to visit Friedrichshafen.