Weather is probably a major factor when you plan your trip to Colonia, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and November with an average temp of 83°F, while the coldest months are February and March with an average of 82°F. The rainiest months in Colonia are July, October, September, and August, with each month seeing an average of 16 inches of rainfall.