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South Carolina United States

Weather in Charleston for September 2025

Your guide to Charleston weather in September - trends and predictions
  • In general, the average temperature in Charleston at the beginning of September is 27 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 29.6 °F by the end of September.

  • The climate of Charleston in September is notably wet, with an average of 14 rainy days.

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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/21°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Charleston in September average weather

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Temperatures trend during September in Charleston

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Patchy rain possible
Patchy rain possible
31° /25° 0.2 mm 7
Sept. 2 Patchy rain possible
Patchy rain possible
31° /25° 1.3 mm 7
Sept. 3 Light rain shower
Light rain shower
26° /24° 2 mm 6
Sept. 4 Light rain shower
Light rain shower
27° /21° 2.5 mm 6
Sept. 5 Patchy rain possible
Patchy rain possible
27° /22° 1.5 mm 6
Sept. 6 Light rain shower
Light rain shower
25° /22° 13.6 mm 6
Sept. 7 Heavy rain
Heavy rain
22° /21° 47.5 mm 5
Sept. 8 Light rain shower
Light rain shower
21° /20° 23.3 mm 5
Sept. 9 Light rain shower
Light rain shower
24° /21° 6.9 mm 5
Sept. 10 Patchy rain possible
Patchy rain possible
27° /20° 0.2 mm 6
Sept. 11 Patchy rain possible
Patchy rain possible
27° /23° 0.1 mm 6
Sept. 12 Mist
Mist
28° /24° 1 mm 7
Sept. 13 Mist
Mist
30° /23° 3.4 mm 7
Sept. 14 Overcast
Overcast
28° /21° 1 mm 6
Sept. 15 Partly cloudy
Partly cloudy
29° /22° 0.7 mm 7
Sept. 16 Partly cloudy
Partly cloudy
27° /20° 0 mm 7
Sept. 17 Torrential rain shower
Torrential rain shower
29° /20° 29.5 mm 7
Sept. 18 Overcast
Overcast
29° /21° 0 mm 6
Sept. 19 Cloudy
Cloudy
31° /21° 5.3 mm 7
Sept. 20 Overcast
Overcast
29° /21° 0 mm 7
Sept. 21 Light rain shower
Light rain shower
28° /22° 0.9 mm 6
Sept. 22 Overcast
Overcast
28° /21° 0 mm 7
Sept. 23 Overcast
Overcast
28° /19° 0.5 mm 7
Sept. 24 Sunny
Sunny
32° /22° 0 mm 8
Sept. 25 Sunny
Sunny
32° /23° 0 mm 7
Sept. 26 Torrential rain shower
Torrential rain shower
29° /23° 24.7 mm 6
Sept. 27 Patchy rain possible
Patchy rain possible
28° /23° 44.7 mm 7
Sept. 28 Patchy rain possible
Patchy rain possible
28° /21° 0 mm 7
Sept. 29 Overcast
Overcast
29° /21° 3.5 mm 7
Sept. 30 Overcast
Overcast
29° /22° 0 mm 7
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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.

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 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Charleston during September?
Significant rainfall exceeding 201 mm is expected in Charleston 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 during September?
The average wind speed in Charleston during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

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Location coordinates Where is Charleston?

Get accurate weather forecasts for Charleston, located at latitude 32.777 and longitude -79.931. Stay updated with localized weather information tailored for Charleston.

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