You might spend a lot of your holiday inside, but if you’re planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually March and April, with an average temperature of 30°C, while the coldest months are December and January, with an average of 27°C. The rainiest months in Battambang are October, September, August and July, with each month seeing an average of 205 mm of rainfall.