Weather is probably a major factor when you plan your trip to Popayán, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and August, with an average temperature of 16°C, while the coldest months are August and January, with an average of 16°C. The rainiest months in Popayán are July, May, June and April, with each month seeing an average of 802 mm of rainfall.