The hottest month in Cat Island is August when the average maximum temperature is 33°, average temperature is 30° and average minimum temperature is 27°.
The coolest month in Cat Island is January when the average maximum temperature is 26°, average temperature is 22° and average minimum temperature is 19°.
The longest days in Cat Island are in June, with an average of 13.7 hours of daylight per day. December has the shortest days with an average of 10.6 hours of daylight per day.
The sunniest days in Cat Island are in June which has the most hours of sunshine per day with an average of 8.9 hours of sunshine per day, making it a sunny month with few clouds. December has the least sunshine with an average of 6.7 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in July when it reaches 12.5 and lowest in December when it reaches 5.6.
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 Cat Island are found in August when they peak at 29° and lowest in March when they dip to 24°.
The sea is best for swimming between June and December when the temperature is above 26° which is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Cat Island is August with 189.4cm of rain and September has the most days of rain with 17.4 days with some rain, a very wet time to visit the beach.
The driest month in Cat Island is March with 1.8cm of rain and the least days of rain with 4.7 days with some rain, a very dry time to visit the beach.
The most humid month in Cat Island is August with a dew point (an indicator of humidity) of 26° which is extremely humid and uncomfortable unless you are on a beach. At night you would most likely require airconditioning.
The least humid month in Cat Island is March with a dew point of 20° which is somewhat uncomfortable for most people in cities but fine on a beach.
The most windy month in Cat Island is April when the average maximum windspeed is 27kmh and the average wind speed is 13kmh.
The least windy month in Cat Island is August when the average maximum windspeed is 22kmh and the average wind speed is 10kmh.