Weather in Hilton Head Island: May
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Average day temperature: | 79.7°F |
| Average night temperature: | 68.0°F | |
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Sea water temperature: | 75.2°F |
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Number of sunny days: | 11 days |
| Day length: | 13.5 - 14.1 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.3 in. | |
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forecast
| Hilton Head Island |
temperature
| Hilton Head Island |
Air temperature in May, °F
The highest day temperature during May of 2025 was 95°F. At the same time the lowest night temperature was 67°F. Daily and nightly averages during May were 84.2°F and 72.5°F.
Sea water temperature in Hilton Head Island in May, °F
The average sea water temperature in May of 2025 was 76.7°F. The highest and lowest sea temperatures during the month were 79.9°F and 73.6°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 Hilton Head Island in May is 1.3 in. Other months of the year show relatively similar values.
The average wind speed value in May is 7.2 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 Hilton Head Island
Hilton Head Island on a weather map
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