Weather is probably a major factor when you plan your trip to Wenchi, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 83°F, while the coldest months are January and August with an average of 79°F. The rainiest months in Wenchi are September, October, June, and May, with each month seeing an average of 9 inches of rainfall.