Charleston in September
7.0out of 10
Possible, with caveats
Warm and comfortable: highs around 28°C. Frequent rain: about 14 rainy days.
28°CAvg high
22°CAvg low
14Rainy days (128 mm)
12:11 hDaylight
07:08Sunrise · 19:20 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Frequent rain: about 14 rainy days
- Rain varies a lot between years (±4.2 days)
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rain in September varies a lot between years (±4.2 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 15°C | 6°C | 81 mm | 8 | – | – | 6.9 |
| February | 17°C | 8°C | 84 mm | 8 | – | – | 7.2 |
| March | 20°C | 11°C | 81 mm | 8 | – | – | 7.7 |
| April | 23°C | 15°C | 74 mm | 8 | – | – | 8.1 |
| May | 27°C | 19°C | 67 mm | 9 | – | – | 7.8 |
| June | 30°C | 23°C | 130 mm | 16 | – | – | 6.6 |
| July | 31°C | 25°C | 138 mm | 18 | – | – | 5.8 |
| August | 30°C | 24°C | 161 mm | 19 | – | – | 5.8 |
| September | 28°C | 22°C | 128 mm | 14 | – | – | 7.0 |
| October | 25°C | 16°C | 100 mm | 8 | – | – | 7.9 |
| November | 20°C | 11°C | 66 mm | 7 | – | – | 7.8 |
| December | 17°C | 8°C | 86 mm | 8 | – | – | 7.1 |
Frequently asked questions
How hot is Charleston in September?
Daytime highs average 28°C and nights about 22°C.
When is the best time to visit Charleston?
The best months are April, October, May, November.