Planning for the weather is a good way to make your trip to Manu relaxing and enjoyable, especially when you're splurging. The hottest months are usually September and August with an average temp of 78°F, while the coldest months are July and June with an average of 75°F. The rainiest months in Manu are March, January, February, and December, with each month seeing an average of 12 inches of rainfall.