Planning for the weather is an important factor for making your trip to Brazzaville a success, especially when you’re splurging. The hottest months are usually September and August with an average temp of 79°F, while the coldest months are July and June with an average of 77°F. The rainiest months in Brazzaville are November, December, April, and October, with each month seeing an average of 8 inches of rainfall.