September weather forecast
Charleston, WV

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The calm Kanawha River in front of Charleston, West Virginia, reflecting the city in its water
The calm Kanawha River in front of Charleston, West Virginia, reflecting the city in its water

Weather in September

September in Charleston ushers in the beginning of the fall season with a considerable drop in temperatures compared to the summer months, the high being 77.9°F (25.5°C). With lower temperatures, September brings residents relief from the summer's peak heat. This month sees fewer rainfall days, starting a downward trend for the following months. Longer nights and shorter days start to set in, setting the stage for autumn. September then welcomes a cooler Charleston, filled with early fall colors.

Temperature

As August shifts into September in Charleston, a minor alteration in temperatures is observed, with average highs reducing from a moderately hot 84.6°F (29.2°C) to a still warm 77.9°F (25.5°C). During September, an average low-temperature of 56.7°F (13.7°C) is observed.

Humidity

In Charleston, the average relative humidity in September is 77%.

Rainfall

The month with the least rainfall in Charleston, West Virginia, is September, when the rain falls for 13.9 days and typically collects 1.81" (46mm) of precipitation.

Snowfall

June through September are months without snowfall in Charleston.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of September in Charleston, West Virginia, sunrise is at 6:56 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:10 pm EDT.

Sunshine

In Charleston, the average sunshine in September is 8.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Updated: Feb 14, 2024 | Published by: Weather Atlas | Resources

Frequently asked questions

What is the usual temperature for Charleston in September?

In Charleston, in September, the average high-temperature is 77.9°F (25.5°C), and the average low-temperature is 56.7°F (13.7°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 93.2°F (34°C).

What is the average humidity in September in Charleston?

In September, the average relative humidity in Charleston is 77%.

What is the driest month in Charleston?

September is the month with the least rainfall in Charleston. Rain falls for 13.9 days and accumulates 1.81" (46mm) of precipitation.

How many days does it rain in September in Charleston?

In September, the rain falls for 13.9 days. Throughout September, 1.81" (46mm) of precipitation is accumulated.

When it does not snow in Charleston?

June through September are months without snowfall.

Does it snow in Charleston in September?

In Charleston, West Virginia, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Charleston have in September?

In September, the average day length in Charleston, West Virginia, is 12h and 25min.

When is the sunrise / sunset in September in Charleston?

In September, on the first day of the month, sunrise is at 6:56 am and sunset at 7:55 pm. On the last day of the month, in Charleston, sunrise is at 7:22 am and sunset at 7:10 pm EDT.

How long on average sun shines in September in Charleston?

In Charleston, West Virginia, the average sunshine duration in September is 8.3h.

What is the UV index reading in September in Charleston?

In September, the average daily maximum UV index in Charleston is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Charleston, WV

Average temperature in September - Charleston, WV
  • Average high temperature in September: 77.9°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).

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Average pressure in September
Charleston, WV

Average pressure in September - Charleston, WV
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

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Average wind speed in September
Charleston, WV

Average wind speed in September - Charleston, WV
  • Average wind speed in September: 4.3mph

The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest month (with the lowest average wind speed) is August (4mph).

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Average humidity in September
Charleston, WV

Average humidity in September - Charleston, WV
  • Average humidity in September: 77%

The months with the highest relative humidity are January and February (82%).
The months with the lowest relative humidity are June, July, August and November (76%).

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Average rainfall in September
Charleston, WV

Average rainfall in September - Charleston, WV
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is May (3.94").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in September
Charleston, WV

Average rainfall days in September - Charleston, WV
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is November (11 days).

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Average snowfall in September
Charleston, WV

Average snowfall in September - Charleston, WV
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.51").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Charleston, WV

Average snowfall days in September - Charleston, WV
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Charleston, WV

Average daylight in September / Average sunshine in September - Charleston, WV
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in September
Charleston, WV

Average sunshine days in September - Charleston, WV
  • Average sunshine days in September: 13.5 days

The months with the most sunshine days are October and November (16.5 days).
The month with the least sunshine days is February (8.4 days).

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Average UV index in September
Charleston, WV

Average UV index in September - Charleston, WV
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in September
Charleston, WV

Average cloud cover in September - Charleston, WV
  • Average cloud cover in September: 37

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Charleston, WV

Average visibility in September - Charleston, WV
  • Average visibility in September: 5mi

The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).

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Charleston, West Virginia, USA

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