Other facts from our historical weather data: When is the rainy season in Thimphu? Rainy season in Thimphu occurs in the months of May, June, July, August and September. Which is the warmest month in Thimphu? August has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Thimphu? The coldest month is January with an average maximum temperature of 7°C (45°F). Which is the wettest month in Thimphu? July tops the wettest month list with 512mm (20.2 in) of rainfall. Which is the driest month in Thimphu? December is the driest month with 54mm (2.1 in) of precipitation. 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.