Monthly weather forecast and climate
Cayo Guillermo, Cuba

The best time to visit Cayo Guillermo

The best months for a swim in Cayo Guillermo, Cuba, are February and April, with a perfect temperature - varying between 25°C (77°F) and 29°C (84.2°F), and scarce rainfall.

Weather in January

January, like December, in Cayo Guillermo, Cuba, is another warm winter month, with temperature in the range of an average high of 27°C (80.6°F) and an average low of 17°C (62.6°F). The coldest month is January, with an average high-temperature of 27°C (80.6°F) and an average low-temperature of 17°C (62.6°F). Weather in January »

Weather in February

February, the last month of the winter, in Cayo Guillermo, is also a moderately hot month, with average temperature varying between 17°C (62.6°F) and 28°C (82.4°F). An excellent water temperature of 25°C (77°F) and only 5 rainfall days, with 43mm (1.69") of accumulated rainfall, makes February a prime for swimming and other water activities. Weather in February »

Weather in March

March, the first month of the spring, in Cayo Guillermo, is also a moderately hot month, with average temperature ranging between min 18°C (64.4°F) and max 29°C (84.2°F). In March, the average high-temperature is almost the same as in February - a still warm 29°C (84.2°F). Weather in March »

Weather in April

April is a hot spring month in Cayo Guillermo, Cuba, with average temperature varying between 19°C (66.2°F) and 31°C (87.8°F). The ideal sea water temperature of 26°C (78.8°F) and only 5 rainfall days, with 60mm (2.36") of accumulated rainfall, makes April the best time for swimming and other water activities. Weather in April »

Weather in May

The last month of the spring, May, is another tropical month in Cayo Guillermo, Cuba, with average temperature ranging between min 21°C (69.8°F) and max 31°C (87.8°F). In Cayo Guillermo, the average high-temperature remains the same as in April - a still tropical 31°C (87.8°F). Weather in May »

Weather in June

June, the first month of the summer, in Cayo Guillermo, is still a tropical month, with average temperature varying between 23°C (73.4°F) and 32°C (89.6°F). In Cayo Guillermo, the average high-temperature is relatively the same as in May - a still hot 32°C (89.6°F). Weather in June »

Weather in July

July, like June, is another tropical summer month in Cayo Guillermo, Cuba, with average temperature varying between 33°C (91.4°F) and 23°C (73.4°F). July and August, with an average high-temperature of 33°C (91.4°F), are the warmest months. In Cayo Guillermo, it is raining for 13 days, with typically 90mm (3.54") of accumulated precipitation. Weather in July »

Weather in August

August, the last month of the summer, in Cayo Guillermo, is also a hot month, with average temperature fluctuating between 33°C (91.4°F) and 23°C (73.4°F). The warmest months are July and August, with an average high-temperature of 33°C (91.4°F). In Cayo Guillermo, it is raining for 15 days, with typically 117mm (4.61") of accumulated precipitation. Weather in August »

Weather in September

September, the first month of the autumn, in Cayo Guillermo, is still a hot month, with average temperature ranging between max 32°C (89.6°F) and min 22°C (71.6°F). In September, the average high-temperature is practically the same as in August - a still hot 32°C (89.6°F). Weather in September »

Weather in October

October, like September, is a hot autumn month in Cayo Guillermo, Cuba, with temperature in the range of an average low of 22°C (71.6°F) and an average high of 31°C (87.8°F). In October, the average high-temperature is almost the same as in September - a still tropical 31°C (87.8°F). Weather in October »

Weather in November

The last month of the autumn, November, is also a moderately hot month in Cayo Guillermo, Cuba, with average temperature varying between 20°C (68°F) and 29°C (84.2°F). In November, the average high-temperature is relatively the same as in October - a moderately hot 29°C (84.2°F). Weather in November »

Weather in December

December, the first month of the winter, in Cayo Guillermo, is still a warm month, with average temperature fluctuating between 28°C (82.4°F) and 18°C (64.4°F). In Cayo Guillermo, the average high-temperature is essentially the same as in November - a still moderately hot 28°C (82.4°F). Weather in December »
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FAQ

What is the coldest month in Cayo Guillermo?

The coldest month is January, with an average high-temperature of 27°C (80.6°F) and an average low-temperature of 17°C (62.6°F).

How many days does it rain in Cayo Guillermo?

Throughout the year, in Cayo Guillermo, there are 125 rainfall days, and 1200mm (47.24") of precipitation is accumulated.

What are the months with the coldest sea water in Cayo Guillermo?

Through and March, with an average sea temperature of 25°C (77°F).

What is the month with the least sunshine in Cayo Guillermo?

January, February, June, September through December, with an average of 7h of sunshine, are months with the least sunshine in Cayo Guillermo, Cuba.

What month has the most sunshine in Cayo Guillermo?

With an average of 9h of sunshine, April has the most sunshine of the year in Cayo Guillermo.

What is the month with the highest UV index in Cayo Guillermo?

April through August, with an average maximum UV index of 12, are months with the highest UV index.

When is the sea warmest in Cayo Guillermo?

Months with the warmest seawater are June through October, with an average sea temperature of 29°C (84.2°F).

When are the longest days in Cayo Guillermo?

With an average of 13.5h of daylight, June has the longest days of the year in Cayo Guillermo.

What is the warmest month in Cayo Guillermo?

July and August, with an average high-temperature of 33°C (91.4°F), are warmest months in Cayo Guillermo.

What is the wettest month in Cayo Guillermo?

The month with the most rainfall in Cayo Guillermo is October when the rain falls for 16 days and typically aggregates up to 182mm (7.17") of precipitation.

What is the driest month in Cayo Guillermo?

The month with the least rainfall in Cayo Guillermo is December when the rain falls for 7 days and typically collects 39mm (1.54") of precipitation.

What is the month with the shortest days in Cayo Guillermo?

The month with the shortest days in Cayo Guillermo is December, with an average of 10.8h of daylight.

What is the month with the lowest UV index in Cayo Guillermo?

The month with the lowest UV index is December, with an average maximum UV index of 6.

Average temperature
Cayo Guillermo, Cuba

Average temperature - Cayo Guillermo, Cuba

The warmest months (with the highest average high temperature) are July and August (33°C).
The month with the lowest average high temperature is January (27°C).

Months with the highest average low temperature are June, July and August (23°C).
The coldest months (with the lowest average low temperature) are January and February (17°C).

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Average rainfall
Cayo Guillermo, Cuba

Average rainfall - Cayo Guillermo, Cuba

The wettest month (with the highest rainfall) is October (182mm).
The driest month (with the least rainfall) is December (39mm).

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Average rainfall days
Cayo Guillermo, Cuba

Average rainfall days - Cayo Guillermo, Cuba

The month with the highest number of rainy days is October (16 days).
Months with the least rainy days are February and April (5 days).

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Average sea temperature
Cayo Guillermo, Cuba

Average sea temperature - Cayo Guillermo, Cuba

The best months for swimming (with the highest average sea temperature) are June, July, August, September and October (29°C).
The coldest months (with the lowest average sea temperature) are January, February and March (25°C).

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Average daylight / Average sunshine
Cayo Guillermo, Cuba

Average daylight / Average sunshine - Cayo Guillermo, Cuba

The month with the longest days is June (Average daylight: 13.5h).
The month with the shortest days is December (Average daylight: 10.8h).

The month with the most sunshine is April (Average sunshine: 9h).
Months with the least sunshine are January, February, June, September, October, November and December (Average sunshine: 7).

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Average UV index
Cayo Guillermo, Cuba

Average UV index - Cayo Guillermo, Cuba

Months with the highest UV index are April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).

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