Water temperature in Hilton Head Island (SC) in September
Is it warm enough to swim in Hilton Head Island in September? Average water temperature in Hilton Head Island in September is 81.7°F and therefore suitable for comfortable swimming. The warmest sea in Hilton Head Island in September is 86.7°F, and the coldest is 76.1°F. Average high air temperature in Hilton Head Island in September is 85°F, and average low temperature is 68°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Hilton Head Island
Changes water temperature in Hilton Head Island in September 2025, 2024
To get an accurate forecast for the water temperature in Hilton Head Island for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Hilton Head Island, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 1 | 80.8°F | 84.4°F | 80.8°F | 86.2°F |
| September 2 | 80.4°F | 84.7°F | 80.4°F | 86.2°F |
| September 3 | 79.5°F | 84°F | 79.5°F | 86.2°F |
| September 4 | 80.1°F | 83.3°F | 80.1°F | 86.7°F |
| September 5 | 80.8°F | 82.9°F | 80.8°F | 86.4°F |
| September 6 | 80.6°F | 82.2°F | 80.6°F | 86°F |
| September 7 | 81.1°F | 81.9°F | 80.4°F | 85.5°F |
| September 8 | 81.1°F | 81.5°F | 80.8°F | 84.9°F |
| September 9 | 80.8°F | 79.9°F | 79.9°F | 84.4°F |
| September 10 | 79.9°F | 78.3°F | 78.3°F | 84.6°F |
| September 11 | 79.2°F | 78.4°F | 78.4°F | 84.7°F |
| September 12 | 78.8°F | 78.6°F | 78.6°F | 84.9°F |
| September 13 | 78.6°F | 77.7°F | 77.7°F | 85.1°F |
| September 14 | 78.3°F | 78.4°F | 78.3°F | 84.7°F |
| September 15 | 77.7°F | 77.5°F | 77.5°F | 84°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 16 | 77.7°F | 77.7°F | 77.7°F | 83.7°F |
| September 17 | 77.7°F | 77.7°F | 77.7°F | 84°F |
| September 18 | 78.1°F | 77.5°F | 77.5°F | 84.2°F |
| September 19 | 79.5°F | 78.3°F | 78.3°F | 83.5°F |
| September 20 | 79.9°F | 77.9°F | 77.9°F | 83.5°F |
| September 21 | 79.9°F | 78.6°F | 78.6°F | 83.5°F |
| September 22 | 78.8°F | 78.4°F | 77.7°F | 83.7°F |
| September 23 | 79.9°F | 79.3°F | 77.5°F | 83.3°F |
| September 24 | 80.6°F | 79.7°F | 77.2°F | 83.1°F |
| September 25 | 80.8°F | 79.9°F | 76.8°F | 83.1°F |
| September 26 | 81.1°F | 79.9°F | 76.3°F | 83.1°F |
| September 27 | 81.1°F | 80.1°F | 76.3°F | 83.5°F |
| September 28 | 80.8°F | 80.1°F | 76.1°F | 83.5°F |
| September 29 | 80.6°F | 80.2°F | 76.8°F | 83.1°F |
| September 30 | 78.8°F | 80.2°F | 76.5°F | 82.8°F |
Average water temperature in Hilton Head Island in September over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 81.9°F | 80.4°F | 83.7°F | 81.9°F | 82°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 82°F | 82.2°F | 82.2°F | 80.1°F |
Hilton Head Island sea state in September
Chart comparing the height of waves in Hilton Head Island in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Hilton Head Island in September
This data display average monthly climate indicators in Hilton Head Island in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature85°F
- Average LOW temperature68°F
- Average rainfall days10 days
- Average rainfall130mm/5.1''
- Average daylight12h
- Average sunshine7h
- Average UV index8
Hilton Head Island water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
