Charleston County (Charleston)
September
Weather in Charleston County, South Carolina for September 2026
Your guide to Charleston County weather in September - trends and predictions
So far, September 2026 in Charleston County is slightly warmer than the historical average by 0.8 °F.
The forecast for the next days in Charleston County predicts a temperature of 27.1 °F, which is cooler than the historical average.
In general, the average temperature in Charleston County at the beginning of September is 30 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 29 °F by the end of September.
The climate of Charleston County in September is notably wet, with an average of 14 rainy days, and a total of 190.1 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
14
Rainy days
0
Snow days
28°/22°
Temperatures
20 km/h
Avg max wind
74 %
Avg humidity
Charleston County Weather September
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Temperatures trend during September in Charleston County
See the weather trend as well as the moving average line
September weather in Charleston County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 30° /24° | 1 mm | 7 | |
| Sept. 2 | Patchy rain possible | 31° /24° | 0.4 mm | 7 | |
| Sept. 3 | Light rain shower | 29° /24° | 0.7 mm | 8 | |
| Sept. 4 | Light rain shower | 30° /23° | 2.6 mm | 6 | |
| Sept. 5 | Patchy rain possible | 31° /24° | 0.5 mm | 8 | |
| Sept. 6 | Light rain shower | 31° /22° | 4.5 mm | 7 | |
| Sept. 7 |  Heavy rain | 28° /22° | 41.5 mm | 7 | |
| Sept. 8 | Light rain shower | 26° /21° | 88.8 mm | 6 | |
| Sept. 9 | Light rain shower | 27° /21° | 3.1 mm | 6 | |
| Sept. 10 | Patchy rain possible | 29° /21° | 17.6 mm | 5 | |
| Sept. 11 | Patchy rain possible | 28° /22° | 5.3 mm | 5 | |
| Sept. 12 |  Mist | 29° /23° | 2.5 mm | 6 | |
| Sept. 13 | Mist | 31° /23° | 1.9 mm | 7 | |
| Sept. 14 |  Overcast | 30° /22° | 0.9 mm | 7 | |
| Sept. 15 |  Partly cloudy | 30° /22° | 0.4 mm | 6 | |
| Sept. 16 | Partly cloudy | 28° /20° | 0 mm | 6 | |
| Sept. 17 |  Cloudy | 29° /20° | 14.8 mm | 7 | |
| Sept. 18 | Cloudy | 31° /22° | 0 mm | 7 | |
| Sept. 19 |  Moderate or heavy rain shower | 31° /22° | 5.3 mm | 7 | |
| Sept. 20 | Overcast | 30° /21° | 0.6 mm | 6 | |
| Sept. 21 | Light rain shower | 29° /22° | 1.1 mm | 5 | |
| Sept. 22 | Overcast | 29° /21° | 2.4 mm | 6 | |
| Sept. 23 | Overcast | 27° /20° | 0.3 mm | 5 | |
| Sept. 24 |  Sunny | 29° /20° | 8.6 mm | 6 | |
| Sept. 25 | Sunny | 30° /21° | 0 mm | 7 | |
| Sept. 26 | Torrential rain shower | 29° /21° | 12.4 mm | 7 | |
| Sept. 27 | Patchy rain possible | 28° /21° | 30 mm | 7 | |
| Sept. 28 | Sunny | 28° /19° | 0 mm | 7 | |
| Sept. 29 | Sunny | 30° /19° | 0 mm | 7.2 | |
| Sept. 30 | Sunny | 29° /22° | 0 mm | 7.2 | |
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Important Notice
Our weather forecast for Charleston County 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 County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Charleston County in September - FAQ
What are the expected maximum and minimum temperatures in Charleston County 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 County during September?
Significant rainfall exceeding 190.1 mm is expected in Charleston County during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Charleston County during September?
The average wind speed in Charleston County during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Charleston County
Explore the daily rainfall trends and prepare for Charleston Countys September weather 💧
Typically, Charleston County has 14 rainy days in September with a total of 190.1 mm of rainfall.
UV exposure in Charleston County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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