Planning for the weather is an important factor for making your trip to Mogi das Cruzes a success, especially when you're splurging. 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 Mogi das Cruzes are January, February, December and November, with each month seeing an average of 257 mm of rainfall.