August in Hamar is the rainiest month of the year. In August, the weather in Hamar is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Hamar has 18 rainy, 7 sunny, 4 partly cloudy, and 2 cloudy days in August. The rains are usually heavy. August as well as March, April, May, and July is considered the most uncomfortable time to visit Hamar.