April in Bremerhaven is the sunniest month of the year. In April, the weather in Bremerhaven is typically warm. Average daily high temperature in April is about 10 degrees above zero. On average, Bremerhaven has 12 rainy, 10 sunny, 7 partly cloudy, and 1 cloudy day in April. The rains are usually moderate. April as well as January, February, March, and May is considered the most uncomfortable time to visit Bremerhaven.