Weather is probably a major factor when you plan your trip to Kolonia, and keep 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 temp of 83°F, while the coldest months are March and July with an average of 82°F. The rainiest months in Kolonia are May, July, November, and June, with each month seeing an average of 16 inches of rainfall.