Weather is probably a major factor when you plan your trip to Navrongo, 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 91°F, while the coldest months are January and December with an average of 82°F. The rainiest months in Navrongo are August, September, July, and June, with each month seeing an average of 7 inches of rainfall.