Weather will likely play an important role when you plan your trip to Sao Paulo, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January, with an average temperature of 23°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Sao Paulo are January, December, February and November, with each month seeing an average of 224 mm of rainfall.