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