Weather will likely play an important role when you plan your trip to Tres Lagoas, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October, with an average temperature of 27°C, while the coldest months are June and July, with an average of 22°C. The rainiest months in Tres Lagoas are January, December, February and March, with each month seeing an average of 232 mm of rainfall.