Weather in Cayo Guillermo: December
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Average day temperature: | 78.5°F |
| Average night temperature: | 74.4°F | |
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Sea water temperature: | 79.1°F |
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Number of sunny days: | 9 days |
| Day length: | 10.7 - 10.9 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 1.0 in. | |
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forecast
| Cayo Guillermo |
temperature
| Cayo Guillermo |
Air temperature in December, °F
The highest day temperature during December of 2025 was 80°F. At the same time the lowest night temperature was 73°F. Daily and nightly averages during December were 78.5°F and 76.6°F.
Sea water temperature in Cayo Guillermo in December, °F
The average sea water temperature in December of 2025 was 80.0°F. The highest and lowest sea temperatures during the month were 82.0°F and 76.8°F.
Number of sunny, partly cloudy and cloudy days in December is almost equal.
Precipitation total in December, in.
Precipitation total value in Cayo Guillermo in December is 1.0 in. Other months of the year show relatively similar values.
The average wind speed value in December is 14.6 mph It makes December one of the most windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 6.0.
Best time for vacation in Cayo Guillermo
Cayo Guillermo on a weather map
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