Weather can make or break a roadtrip, so here's some data about year-round temperatures in Mouila to help you plan yours: The hottest months are usually March and April with an average temp of 78°F, while the coldest months are July and June with an average of 77°F. The rainiest months in Mouila are November, October, December, and March, with each month seeing an average of 15 inches of rainfall.