April in Delfzijl is the sunniest month of the year. Average daily high temperature in April is about 10 degrees above zero. On average, Delfzijl has 11 rainy, 9 sunny, 9 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 Delfzijl.