Weather will likely play an important role when you plan your trip to São José dos Campos, 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 22°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in São José dos Campos are January, December, February and November, with each month seeing an average of 204 mm of rainfall.