Weather is probably a major factor when you plan your trip to Wau, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually December and February with an average temp of 68°F, while the coldest months are September and July with an average of 66°F. The rainiest months in Wau are September, June, August, and July, with each month seeing an average of 27 inches of rainfall.