Other facts from our historical weather data: When is the rainy season in Ban Bu Yai Bai? Rainy season in Ban Bu Yai Bai occurs in the months of May, June, July, August, September and October. Does Ban Bu Yai Bai have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Ban Bu Yai Bai? April has an average maximum temperature of 36°C (97°F) and is the hottest month of the year. Which is the coolest month in Ban Bu Yai Bai? The coolest month is January with an average maximum temperature of 32°C (90°F). Which is the wettest month in Ban Bu Yai Bai? September tops the wettest month list with 317mm (12.5 in) of rainfall. Which is the driest month in Ban Bu Yai Bai? December is the driest month with 7mm (0.3 in) of precipitation. Which is the sunniest month in Ban Bu Yai Bai? January is the sunniest month with an average of 283 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.