Weather in Hilton Head Island: September
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Average day temperature: | 82.0°F |
| Average night temperature: | 72.7°F | |
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Sea water temperature: | 81.6°F |
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Number of sunny days: | 12 days |
| Day length: | 11.9 - 12.8 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.3 in. | |
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forecast
| Hilton Head Island |
temperature
| Hilton Head Island |
Air temperature in September, °F
The highest day temperature during September of 2025 was 88°F. At the same time the lowest night temperature was 70°F. Daily and nightly averages during September were 81.6°F and 73.8°F.
Sea water temperature in Hilton Head Island in September, °F
The average sea water temperature in September of 2025 was 79.8°F. The highest and lowest sea temperatures during the month were 81.5°F and 77.2°F.
Number of sunny, partly cloudy and cloudy days in September is almost equal.
Precipitation total in September, in.
Precipitation total value in Hilton Head Island in September is 1.3 in. Other months of the year show relatively similar values.
The average wind speed value in September is 7.5 mph It makes September 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 September is: 7.7.
Best time for vacation in Hilton Head Island
Hilton Head Island on a weather map
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