If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Rondonopolis: The hottest months are usually September and October with an average temp of 82°F, while the coldest months are July and June with an average of 76°F. The rainiest months in Rondonopolis are January, February, December, and November, with each month seeing an average of 10 inches of rainfall.