April in Osteraker is the sunniest month of the year. In April, the weather in Osteraker is typically warm. Average daily high temperature in April is about 10 degrees above zero. On average, Osteraker has 10 sunny, 9 partly cloudy, 8 rainy, and 3 cloudy days in April. The rains are usually light. April as well as January, February, March, and October is considered the most uncomfortable time to visit Osteraker.