average temp july cancun
Cancun: Annual Weather Averages. June is the hottest month in Cancun with an average temperature of 28Â°C (82Â°F) and the coldest is January at 23Â°C (73Â°F) with the most daily sunshine hours at 11 in August. The wettest month is September with an average of 270mm of rain. The best month to swim in the sea is in July when the average sea temperature is 29Â°C (84Â°F).