Weather is probably a major factor when you plan your trip to Tha Pho, 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 86°F, while the coldest months are December and January with an average of 79°F. The rainiest months in Tha Pho are August, September, July, and June, with each month seeing an average of 13 inches of rainfall.