July in Geilo is the warmest month of the year. In July, the weather in Geilo is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Geilo has 14 rainy, 8 cloudy, 5 sunny, and 4 partly cloudy days in July. The rains are usually moderate. July as well as May, June, August, and September is considered the most uncomfortable time to visit Geilo.