Weather in Cayo Guillermo: May
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Average day temperature: | 82.7°F |
| Average night temperature: | 77.8°F | |
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Sea water temperature: | 82.2°F |
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Number of sunny days: | 12 days |
| Day length: | 13.0 - 13.4 hours | |
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Number of rainy days: | 6 days |
| Precipitation totals: | 4.3 in. | |
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forecast
| Cayo Guillermo |
temperature
| Cayo Guillermo |
Air temperature in May, °F
The highest day temperature during May of 2026 was 84°F. At the same time the lowest night temperature was 77°F. Daily and nightly averages during May were 82.4°F and 80.1°F.
Sea water temperature in Cayo Guillermo in May, °F
The average sea water temperature in May of 2026 was 84.0°F. The highest and lowest sea temperatures during the month were 86.2°F and 82.4°F.
Mostly all days in May are partly cloudy but sunny or cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Cayo Guillermo in May is 4.5 in. Other months of the year show relatively similar values.
The average wind speed value in May is 13.0 mph It makes May one of the least 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 May is: 8.1.
Best time for vacation in Cayo Guillermo
Cayo Guillermo on a weather map
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