‹ Hilton Head Island weather by month
Typical September weather
Hilton Head Island
South Carolina · September
86° days
70° nights
about 6 rainy days · 12½ hours of daylight · ocean 81°
What to pack
- Swimsuit
- Sunscreen
What September feels like
Once school starts, Hilton Head empties almost overnight and rentals fall to their lowest rates since spring. The catch is honest: this is the most active month of hurricane season here, and every islander can tell you where they were for Matthew.
Expect about 6 days with real rain — enough to notice, not enough to plan around. It’s sticky — light fabrics and an afternoon break earn their keep. about 9 afternoons top 90°.
Can you swim?
The ocean runs about 81° — bath-warm.
The numbers
| Typical high | 86° |
|---|---|
| Typical low | 70° |
| Days with real rain | 6 |
| Total rain | 4.0 in |
| Humidity | sticky |
| Water temperature | 81° |
| Sunrise / sunset (mid-month) | 7:07 am / 7:29 pm |