The hottest month in Roatán is September when the average maximum temperature is 32°, average temperature is 29° and average minimum temperature is 26°.
The coolest month in Roatán is January when the average maximum temperature is 28°, average temperature is 25° and average minimum temperature is 23°.
The longest days in Roatán are in June, with an average of 13.1 hours of daylight per day. December has the shortest days with an average of 11.2 hours of daylight per day.
The sunniest days in Roatán are in March which has the most hours of sunshine per day with an average of 7.8 hours of sunshine per day, making it a quite sunny month with some cloud cover. November has the least sunshine with an average of 5.6 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in April when it reaches 14 and lowest in December when it reaches 8.3.
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 Roatán are found in October when they peak at 29° and lowest in February when they dip to 26°.
The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.
The wettest month in Roatán is November with 48.8cm of rain and the most days of rain with 10.8 days with some rain, a slightly wet time to visit the beach.
The driest month in Roatán is March with 2.8cm of rain and April has the fewest days of rain with 1.4 days with some rain, an extremely dry time to visit the beach.
The most humid month in Roatán 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 Roatán is January 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 Roatán is June when the average maximum windspeed is 30kmh and the average wind speed is 20kmh.
The least windy month in Roatán is November when the average maximum windspeed is 21kmh and the average wind speed is 11kmh.