Weather is probably a major factor when you plan your trip to Pak Nhai, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 75°F, while the coldest months are January and February with an average of 70°F. The rainiest months in Pak Nhai are September, July, August, and May, with each month seeing an average of 17 inches of rainfall.