Other facts from our historical weather data: When is the rainy season in Kampong Cham? Rainy season in Kampong Cham occurs in the months of May, June, July, August, September and October. Does Kampong Cham have a dry season? Yes, the months of January and February are very dry. Which is the hottest month in Kampong Cham? April has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in Kampong Cham? The coolest month is January with an average maximum temperature of 33°C (91°F). Which is the wettest month in Kampong Cham? September tops the wettest month list with 281mm (11.1 in) of rainfall. Which is the driest month in Kampong Cham? February is the driest month with 11mm (0.4 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.