In September, the weather in Merenga is typically cold. Average daily high temperature in September is about 4 degrees above zero. On average, Merenga has 11 rainy, 10 cloudy, 4 snowy, 4 sunny, and 1 partly cloudy day in September. The rains are usually moderate. September as well as January, February, March, and May is considered the most uncomfortable time to visit Merenga.