Weather is probably a major factor when you plan your trip to Rionegro, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and September, with an average temperature of 17°C, while the coldest months are January and July, with an average of 17°C. The rainiest months in Rionegro are April, May, October and November, with each month seeing an average of 439 mm of rainfall.