Other facts from our historical weather data: When is the rainy season in Thanhlyin? Rainy season in Thanhlyin occurs in the months of May, June, July, August, September and October. Does Thanhlyin have a dry season? Yes, the months of January, February, March and December are very dry. Which is the hottest month in Thanhlyin? April has an average maximum temperature of 39°C (102°F) and is the hottest month of the year. Which is the coolest month in Thanhlyin? The coolest month is January with an average maximum temperature of 32°C (90°F). Which is the wettest month in Thanhlyin? July tops the wettest month list with 496mm (19.5 in) of rainfall. Which is the driest month in Thanhlyin? February is the driest month with 3mm (0.1 in) of precipitation. Which is the sunniest month in Thanhlyin? January is the sunniest month with an average of 301 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.