June in Geilo is the sunniest month of the year. In June, the weather in Geilo is typically cold. Average daily high temperature in June is about 9 degrees above zero. On average, Geilo has 14 rainy, 6 sunny, 6 partly cloudy, and 4 cloudy days in June. The rains are usually moderate. June as well as May, July, August, and September is considered the most uncomfortable time to visit Geilo.