Cancun experiences a semi-tropical climate, with year-round average temperatures of 80 °F and summertime highs of 90 °F. Although it is impossible to predict the weather in Cancun more than a few days in advance, the average weather is a reliable weather indicator for your trip there. Cancun occasionally experiences heavy rain, but it is doubtful that it will pour the entire time you're there. Frequently, an hour after a significant downpour, there will be a brilliant sunny day.