Planning for the weather is an important factor for making your trip to Nova Friburgo a success, especially when you're splurging. The hottest months are usually February and January with an average temp of 71°F, while the coldest months are July and August with an average of 63°F. The rainiest months in Nova Friburgo are December, November, January, and March, with each month seeing an average of 14 inches of rainfall.