Weather is probably a major factor when you plan your trip to Khlong Yai, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March, with an average temperature of 27°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Khlong Yai are September, July, August and June, with each month seeing an average of 500 mm of rainfall.