Visiting local bars in Mongomo is more fun when you know what the weather holds. These rainfall averages and temperatures can help you choose the best time for bar hopping. The hottest months are usually February and January with an average temp of 76°F, while the coldest months are July and August with an average of 73°F. The rainiest months in Mongomo are October, September, May, and April, with each month seeing an average of 10 inches of rainfall.