Planning for the weather is a good way to make your trip to Rio Branco relaxing and enjoyable, especially when you’re splurging. The hottest months are usually September and August, with an average temperature of 27°C, while the coldest months are July and June, with an average of 25°C. The rainiest months in Rio Branco are March, February, January and December, with each month seeing an average of 341 mm of rainfall.