April in Frederikshavn is the sunniest month of the year. In April, the weather in Frederikshavn is typically cold. Average daily high temperature in April is about 7 degrees above zero. On average, Frederikshavn has 13 sunny, 9 rainy, 4 cloudy, and 4 partly cloudy days in April. The rains are usually moderate. April as well as January, February, March, and October is considered the most uncomfortable time to visit Frederikshavn.