Planning for the weather is a good way to make your trip to Goiânia relaxing and enjoyable, especially when you're splurging. The hottest months are usually September and October, with an average temperature of 25°C, while the coldest months are July and June, with an average of 22°C. The rainiest months in Goiânia are December, January, February and November, with each month seeing an average of 234 mm of rainfall.