Planning for the weather is a good way to make your trip to São José do Rio Preto relaxing and enjoyable, especially when you're splurging. The hottest months are usually September and October, with an average temperature of 26°C, while the coldest months are July and June, with an average of 21°C. The rainiest months in São José do Rio Preto are January, December, February and March, with each month seeing an average of 237 mm of rainfall.