Getting an idea of what to expect from the weather in Cagayan de Oro will help you enjoy your stay to the fullest. The hottest months are usually May and April with an average temp of 82°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Cagayan de Oro are June, January, May, and July, with each month seeing an average of 14 inches of rainfall.