Other facts from our historical weather data: Which months have the greatest rainfall in Ban Khan Ham? Most rainfall (rainy season) is seen in May, June, July, August, September and October. Does Ban Khan Ham have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Ban Khan Ham? April has an average maximum temperature of 38°C (100°F) and is the hottest month of the year. Which is the coolest month in Ban Khan Ham? The coolest month is January with an average maximum temperature of 33°C (91°F). Which is the wettest month in Ban Khan Ham? September tops the wettest month list with 287mm (11.3 in) of rainfall. Which is the driest month in Ban Khan Ham? December is the driest month with 9mm (0.4 in) of precipitation. Which is the sunniest month in Ban Khan Ham? January is the sunniest month with an average of 273 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.