Charleston (SC)
September
Weather in Charleston, South Carolina for September 2025
Your guide to Charleston weather in September - trends and predictions
So far, September 2025 in Charleston is slightly warmer than the historical average by 1 °F.
The forecast for the upcoming days in Charleston predicts a temperature of 28.9 °F, which is slightly above the historical average.
In general, the average temperature in Charleston at the beginning of September is 28.6 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 28.1 °F by the end of September.
Charleston in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 214.6 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
28°/22°
Temperatures
21 km/h
Avg max wind
75 %
Avg humidity
Charleston Weather September
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Temperatures trend during September in Charleston
See the weather trend as well as the moving average line
September weather in Charleston day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 29° /23° | 1.5 mm | 7 | |
| Sept. 2 | Patchy rain possible | 30° /24° | 0.7 mm | 7 | |
| Sept. 3 | Light rain shower | 27° /23° | 1 mm | 7 | |
| Sept. 4 | Light rain shower | 29° /22° | 1.3 mm | 7 | |
| Sept. 5 | Patchy rain possible | 30° /23° | 0.8 mm | 7 | |
| Sept. 6 | Light rain shower | 29° /22° | 6.8 mm | 7 | |
| Sept. 7 |  Heavy rain | 26° /22° | 60 mm | 6 | |
| Sept. 8 | Light rain shower | 23° /20° | 15.7 mm | 6 | |
| Sept. 9 | Light rain shower | 25° /20° | 3.5 mm | 6 | |
| Sept. 10 | Patchy rain possible | 28° /20° | 0.1 mm | 6 | |
| Sept. 11 | Patchy rain possible | 27° /21° | 0 mm | 6 | |
| Sept. 12 |  Mist | 28° /23° | 1.9 mm | 6 | |
| Sept. 13 | Mist | 30° /22° | 2.2 mm | 7 | |
| Sept. 14 |  Overcast | 29° /21° | 0.7 mm | 7 | |
| Sept. 15 |  Partly cloudy | 29° /22° | 0.7 mm | 7 | |
| Sept. 16 |  Sunny | 32° /20° | 0 mm | 1.8 | |
| Sept. 17 | Sunny | 32° /19° | 0 mm | 1.7 | |
| Sept. 18 | Sunny | 31° /22° | 0 mm | 1.7 | |
| Sept. 19 | Patchy rain possible | 30° /22° | 0.1 mm | 1.5 | |
| Sept. 20 | Patchy rain possible | 28° /22° | 0.2 mm | 0 | |
| Sept. 21 | Patchy rain possible | 27° /24° | 0.3 mm | 5 | |
| Sept. 22 | Patchy rain possible | 28° /24° | 0.1 mm | 5 | |
| Sept. 23 | Partly cloudy | 29° /22° | 0 mm | 6 | |
| Sept. 24 | Sunny | 29° /23° | 0 mm | 6 | |
| Sept. 25 | Sunny | 30° /23° | 0 mm | 7 | |
| Sept. 26 |  Moderate rain | 28° /23° | 7.8 mm | 5 | |
| Sept. 27 | Patchy rain possible | 28° /23° | 1.8 mm | 5 | |
| Sept. 28 | Patchy rain possible | 26° /23° | 1.2 mm | 5 | |
| Sept. 29 | Patchy rain possible | 27° /22° | 3.4 mm | 5 | |
| Sept. 30 | Overcast | 29° /22° | 0 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Charleston in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Charleston forecast closer to your planned date for the most up-to-date weather information.
Change Month
Charleston in September - FAQ
What are the expected maximum and minimum temperatures in Charleston during September?
During September, expect a variety of temperatures with highs around 28° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Charleston during September?
Significant rainfall exceeding 214.6 mm is expected in Charleston during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Charleston during September?
The average wind speed in Charleston during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Charleston
Explore the daily rainfall trends and prepare for Charlestons September weather 💧
UV exposure in Charleston during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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