Charleston in September
7.7out of 10
Yes, a good time to go
Warm and comfortable: highs around 26°C. Frequent rain: about 10 rainy days.
26°CAvg high
15°CAvg low
10Rainy days (97 mm)
12:14 hDaylight
07:14Sunrise · 19:28 Sunset
Why this score
- Warm and comfortable: highs around 26°C
- Frequent rain: about 10 rainy days
What to wear and pack
- T-shirts and light layers
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.9 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 | 7°C | -2°C | 102 mm | 12 | – | – | 4.6 |
| February | 9°C | -1°C | 97 mm | 12 | – | – | 5.1 |
| March | 14°C | 3°C | 119 mm | 14 | – | – | 5.7 |
| April | 20°C | 9°C | 110 mm | 13 | – | – | 6.9 |
| May | 24°C | 13°C | 128 mm | 15 | – | – | 6.9 |
| June | 27°C | 18°C | 124 mm | 14 | – | – | 7.0 |
| July | 29°C | 20°C | 128 mm | 14 | – | – | 6.9 |
| August | 28°C | 19°C | 99 mm | 12 | – | – | 7.5 |
| September | 26°C | 15°C | 97 mm | 10 | – | – | 7.7 |
| October | 20°C | 9°C | 86 mm | 9 | – | – | 7.5 |
| November | 14°C | 4°C | 86 mm | 10 | – | – | 6.4 |
| December | 8°C | 0°C | 105 mm | 12 | – | – | 5.1 |
Frequently asked questions
How hot is Charleston in September?
Daytime highs average 26°C and nights about 15°C.
When is the best time to visit Charleston?
The best months are September, August, October.