Weather will likely play an important role when you plan your trip to Ku Su Man, and keep 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 temp of 84°F, while the coldest months are January and December with an average of 74°F. The rainiest months in Ku Su Man are August, July, September, and May, with each month seeing an average of 14 inches of rainfall.