The hottest month in Cancun is August when the average maximum temperature is 32°, average temperature is 28° and average minimum temperature is 24°.
The coolest month in Cancun is January when the average maximum temperature is 27°, average temperature is 23° and average minimum temperature is 20°.
The longest days in Cancun are in June, with an average of 13.4 hours of daylight per day. December has the shortest days with an average of 10.9 hours of daylight per day.
The sunniest days in Cancun are in February which has the most hours of sunshine per day with an average of 6.9 hours of sunshine per day, making it a quite sunny month with some cloud cover. October has the least sunshine with an average of 5.2 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in May when it reaches 13.2 and lowest in December when it reaches 6.9.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Cancun are found in September when they peak at 29° and lowest in February when they dip to 26°.
The sea is best for swimming between May and December when the temperature is above 27° which is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Cancun is October with 84.6cm of rain and the most days of rain with 12.6 days with some rain, a wet time to visit the beach.
The driest month in Cancun is April with 24.6cm of rain and the least days of rain with 2.9 days with some rain, a slightly wet time to visit the beach.
The most humid month in Cancun is August with a dew point (an indicator of humidity) of 26° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
The least humid month in Cancun is January with a dew point of 21° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.
The most windy month in Cancun is March when the average maximum windspeed is 29kmh and the average wind speed is 15kmh.
The least windy month in Cancun is September when the average maximum windspeed is 23kmh and the average wind speed is 9kmh.