Other facts from our historical weather data: When is the rainy season in Disentis? Rainy season in Disentis occurs in the months of May, June, July, August, September and November. Which is the warmest month in Disentis? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Disentis? The coldest month is January with an average maximum temperature of -4°C (25°F). Which is the wettest month in Disentis? August tops the wettest month list with 223mm (8.8 in) of rainfall. Which is the driest month in Disentis? February is the driest month with 108mm (4.3 in) of precipitation. Which is the sunniest month in Disentis? July is the sunniest month with an average of 196 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.