Charleston Weather in September: Temperature, Precipitation, Wind

Temperature
19.5°C
67.2°F
High temperature
25.7°C
78.3°F
Low temperature
15°C
59.1°F
Feels like
19.7°C
67.4°F
Rainy days
12 days
Rainfall level
2.97mm
0.12 inch
Cloud coverage
58.9%
Wind speed
12.3km/h
7.6mph
Daylight time
12:25:45
UV index
5.6
1
partly cloudy day
20.5°C
69.0°F
2
clear day
22.6°C
73.0°F
3
partly cloudy day
23.8°C
75.0°F
4
partly cloudy day
24.5°C
76.0°F
5
clear day
25.1°C
77.0°F
6
partly cloudy day
25.1°C
77.0°F
7
rain
24.3°C
76.0°F
8
rain
22.0°C
72.0°F
9
rain
20.7°C
69.0°F
10
rain
20.3°C
69.0°F
11
rain
20.8°C
69.0°F
12
rain
19.3°C
67.0°F
13
partly cloudy day
20.0°C
68.0°F
14
partly cloudy day
17.1°C
63.0°F
15
partly cloudy day
16.5°C
62.0°F
16
partly cloudy day
17.5°C
64.0°F
17
rain
16.4°C
62.0°F
18
partly cloudy day
16.6°C
62.0°F
19
partly cloudy day
16.2°C
61.0°F
20
partly cloudy day
16.6°C
62.0°F
21
partly cloudy day
18.5°C
65.0°F
22
partly cloudy day
18.7°C
66.0°F
23
rain
16.4°C
62.0°F
24
rain
15.5°C
60.0°F
25
rain
17.0°C
63.0°F
26
cloudy
19.1°C
66.0°F
27
rain
19.1°C
66.0°F
28
rain
18.4°C
65.0°F
29
partly cloudy day
19.0°C
66.0°F
30
partly cloudy day
18.3°C
65.0°F

Charleston, United States in September experiences a warm and humid climate transitioning from summer to fall. The average temperature hovers around 19.5°C (67.2°F), with daytime highs reaching 25.7°C (78.3°F) and nighttime lows dipping to 15.0°C (59.1°F). Humidity levels remain high at 84%, contributing to a warmer “feels like” temperature of 19.7°C (67.4°F) on average.

Precipitation is moderate in Charleston during September, with an average of 2.97 inches (75.4 mm) of rainfall. Rain occurs on approximately 12 days throughout the month, with a 40% probability of precipitation on any given day. The most common precipitation type is rain, and no snowfall is expected during this period.

Wind conditions in Charleston during September are relatively mild. Average wind speeds measure 12.3 mph (19.8 km/h), with gusts reaching up to 23.1 mph (37.2 km/h). Atmospheric pressure remains stable at 1017.8 hPa, indicating fair weather conditions.

Cloud cover in Charleston averages 58.9% during September, resulting in partly cloudy days as the most common weather condition. Visibility extends to 12.3 miles (19.8 km), allowing for clear views of the city’s historic landmarks and coastal areas. The UV index averages 5.6, indicating moderate to high sun exposure.

September in Charleston sees gradually shortening days, with sunrise occurring around 7:08 AM and sunset at approximately 7:34 PM. Popular attractions like the Charleston Harbor and the historic downtown area benefit from the pleasant temperatures and extended daylight hours during this month.

Visitors to Charleston in September should be prepared for warm temperatures and occasional rain showers. The moderate climate allows for comfortable exploration of outdoor attractions such as Folly Beach and the Charleston City Market. Light, breathable clothing and rain gear are recommended for tourists visiting during this time of year.

What is the temperature in Charleston in September?

Average air temperature in Charleston is 19.5°C (67.2°F) in September. The outside temperature in Charleston feels like 19.7°C (67.4°F) on a typical September day. The highest average temperature during sunny days is 25.7°C (78.3°F) and feels like 26.2°C (79.2°F). The lowest average temperature after dark is 15°C (59.1°F) which feels like 15°C (59.1°F).

Daily Temperature in Charleston in September 0°C / 32.0°F 10°C / 50.0°F 20°C / 68.0°F 30°C / 86.0°F 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

How hot is Charleston in September?

The hot temperature in September in Charleston rises to 32.8°C (91°F) on sunny days with low cloud coverage and 84% humidity. During hottest days of September it feels like 34.7 °C (94.5°F). The average maximum temp in Charleston is 25.7°C (94.5°F) during day time in September.

How cold is Charleston in September?

The coldest temp in Charleston in September drops to 10°C (50°F) during the cold nights. With 12.3km/h (7.6mph) winds and 84% humidity it feels like 10°C (50°F) on the coldest nights. The average minimum temperature is 15°C (59.1°F) during night time in September.

Does it rain in Charleston in September?

Yes, it rains for 12 days in Charleston, United States in September averaging 2.97 mm of precipitation. Charleston has a 40% chance for rain throughout the entire month of September.

How much does it rain in Charleston throughout September?

Charleston has 2.97 mm (0.12 inch) of rain per day on average in September. It rains for an average of 12 days out of the entire month.

Is Charleston windy in September?

The average speed of wind in Charleston, United States during September is 12.3km/h (7.6mph) and average windgust is 23.1km/h (14.4mph). On some days in September wind can reach up to 20.5km/h (12.7mph).

Daily wind speed in Charleston in September 0km/h (0mph) 6km/h (4mph) 12km/h (7mph) 18km/h (11mph) 24km/h (15mph) 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

What is the direction of the wind in Charleston in September?

Most days of September the wind is blowing from Southeast direction in Charleston.

What are the humidity levels in Charleston in September?

The average humidity levels in Charleston in September are 84%. Daily humidity levels in Charleston range from 77.5% to 99.5% during September.

Daily humidity levels in Charleston in September 0% 25% 50% 75% 100% 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

How many hours of daylight are in Charleston in September?

Charleston has 12 hours 25 minutes of daylight in September on average. Sunset and sunrise times gradually change throughout the month. Sunrise in Charleston in September is at 7:08:27 and the sunset is at 19:34:12.

What is the cloud coverage in Charleston in September?

Clouds cover 58.9% of the sky on average throughout September in Charleston. The cloud coverage ranges from 17.1% to 100% depending on the day of the month.

What is the UV level in September in Charleston?

The average UV index in Charleston is 5.6 in September. UV levels change throughout the month and range from 1 to 7.

What is the solar radiation in Charleston in September?

The average solar radiation is 107.8 W/m2 (Watts per square meter) in Charleston during September. However solar radiation levels change throughout the month and range from 17.6 W/m2 to 167.5 W/m2.

What is the solar energy during September in Charleston?

The average solar energy during September in Charleston is 9.3 MJ/m2 (megajoules per square metre). Solar energy ranges from 1.4 MJ/m2, to 14.5 MJ/m2 during September.

Are there severe weather risks in Charleston in September?

Yes, there is a 16% risk for severe weather in Charleston, United States in September.

What is the air pressure in Charleston in September?

On average the air pressure in Charleston in September is 1017.8 mb (millibars). Throughout the month the sea level pressure ranges from 1010.3 mb to 1022.5 mb.

What is the visibility in Charleston in September?

The average daylight visibility in Charleston in September is 12.3 km (7.6 miles). Depending on the precipitation the visibility ranges from 4.4 km (2.7 miles) to 16 km (9.9 miles) throughout September.

What is the dew point in Charleston in September?

The average dew point in Charleston during September is 16.2°C (61.2°F).

Where is the data for Charleston climate in September coming from?

The climate data for Charleston, South Carolina, United States in September is collected from the following weather stations.

  • BECKLEY RALEIGH CO AIRPORT, WV US
  • CHARLESTON YEAGER AIRPORT, WV US
  • HUNTINGTON TRI STATE AIRPORT, WV US
  • FW6696 Charleston WV US
  • KBKW
  • KCRW
  • KHTS