When you're travelling with pets, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually September and October, with an average temperature of 29°C, while the coldest months are July and June, with an average of 25°C. The rainiest months in Chapada dos Guimarães are January, February, March and December, with each month seeing an average of 246 mm of rainfall.