The hottest month in Aruba is August when the average maximum temperature is 33°, average temperature is 30° and average minimum temperature is 27°.
The coolest month in Aruba is January when the average maximum temperature is 30°, average temperature is 28° and average minimum temperature is 25°.
The longest days in Aruba are in June, with an average of 12.9 hours of daylight per day. December has the shortest days with an average of 11.4 hours of daylight per day.
The sunniest days in Aruba are in March which has the most hours of sunshine per day with an average of 9 hours of sunshine per day, making it a sunny month with few clouds. April has the least sunshine with an average of 7.2 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in April when it reaches 14.5 and lowest in December when it reaches 9.5.
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 Aruba are found in March when they peak at 27° and lowest in August when they dip to 24°.
The sea is best for swimming between December and May when the temperature is above 26° which is warm and pleasant for relaxing and swimming for long periods.
The wettest month in Aruba is December with 2.2cm of rain and the most days of rain with 10.4 days with some rain, a slightly wet time to visit the beach.
The driest month in Aruba is March with 0cm of rain and the least days of rain with 1.7 days with some rain, an extremely dry time to visit the beach.
The most humid month in Aruba is September 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 Aruba is February with a dew point of 23° 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 Aruba is June when the average maximum windspeed is 40kmh and the average wind speed is 29kmh.
The least windy month in Aruba is November when the average maximum windspeed is 30kmh and the average wind speed is 18kmh.