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Sea
27°
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27°
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27°
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27°
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27°
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29°
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29°
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29°
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29°
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29°
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28°
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27°
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The annual average maximum daily temperature is 29.0°C (84.2°F) which is very warm and perfect for sunbathing on clear days. The annual average water temperature is typically 27.9°C (82.2°F) which is very warm and ideal for relaxing and swimming for the whole day. Annually there are on average 4.8 days of rain per month and 8.0 hours of sun per day.
The best months to visit Cayo Guillermo are January, February, March, April, for the best beach weather, the most sunshine and optimal sunbathing and swimming conditions with the least chance of rain.
The sea is best for swimming between June and November when the sea temperature is above the average 28°C (82°F) which is very warm and ideal for relaxing and swimming for the whole day.
Yes, you can sunbathe in Cayo Guillermo all year round.
The coolest month in Cayo Guillermo is January when the average maximum temperature is 26°C (79°F), average temperature is 23°C (73°F) and average minimum temperature is 20°C (68°F).
More info about the annual temperatures and sunshine.
Yes, you can swim in Cayo Guillermo all year round.
The warmest sea water temperatures in Cayo Guillermo are found in September when they peak at 29°C (85°F) and lowest in March when they dip to 27°C (80°F).
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.
More info about the annual sea temperatures
The hottest month in Cayo Guillermo is August when the average maximum temperature is very hot and perfect for sunbathing on clear days 32°C (89°F), average temperature is 28°C (83°F) and average minimum temperature is 25°C (77°F).
More info about the annual temperatures and sunshine.
The coolest month in Cayo Guillermo is January when the average maximum temperature is 26°C (79°F), average temperature is 23°C (73°F) and average minimum temperature is 20°C (68°F).
More info about the annual temperatures and sunshine
The driest month in Cayo Guillermo is March with 4.5cm (1.8inches) of rain and January has the fewest days of rain with 1.7 days with some rain, an extremely dry time to visit the beach.
More info about the annual rainfall
The coldest sea water temperatures in Cayo Guillermo are found in March when they dip to 27°C (80°F) which is very warm and ideal for relaxing and swimming for the whole day.
More info about the annual sea temperatures.
The warmest sea water temperatures in Cayo Guillermo are found in September when they peak at 29°C (85°F) which is very warm and ideal for relaxing and swimming for the whole day.
More info about the annual sea temperatures.
The most humid month in Cayo Guillermo is August with a dew point (an indicator of humidity) of 25°C (76°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
More info about the annual humidity.
The least humid month in Cayo Guillermo is January with a dew point of 19°C (67°F) which is somewhat uncomfortable for most people in cities but fine on a beach.
More info about the annual humidity.
The most windy month in Cayo Guillermo is March when the average maximum windspeed is 30KM/H (19MPH) and the average wind speed is 17KM/H (10MPH).
More info about the annual wind conditions.
The hottest month in Cayo Guillermo is August when the average maximum temperature is 32°C (89°F), average temperature is 28°C (83°F) and average minimum temperature is 25°C (77°F).
The coolest month in Cayo Guillermo is January when the average maximum temperature is 26°C (26°F), average temperature is 23°C (73°F) and average minimum temperature is 20°C (68°F).
The longest days in Cayo Guillermo are in June, with an average of 13.5 hours of daylight per day. December has the shortest days with an average of 10.8 hours of daylight per day.
The sunniest days in Cayo Guillermo are in April which has the most hours of sunshine per day. The sunshine percentage is 74% making it sunny and pleasant most of the time. The hours of sunshine per day are 9.3hrs making the days long and bright.
December has the least sunshine. The sunshine percentage is 59% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 7.1 hours of sunshine per day.
The ultraviolet index is the highest in May when it reaches 12.7 and lowest in December when it reaches 6.2.
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 wettest month in Cayo Guillermo is October with 17.5cm (6.9inches) of rain and June has the most days of rain with 7.4 days with some rain, a quite rainy time to visit the beach.
The driest month in Cayo Guillermo is March with 4.5cm (1.8inches) of rain and January has the fewest days of rain with 1.7 days with some rain, an extremely dry time to visit the beach.
The most humid month in Cayo Guillermo is August with a dew point (an indicator of humidity) of 25°C (76°F) 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 Cayo Guillermo is January with a dew point of 19°C (67°F) which is somewhat uncomfortable for most people in cities but fine on a beach.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
