Charleston
West Virginia, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Charleston, West VA

September, the first month of the autumn, in Charleston, is also a moderately hot month, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 77.9°F (25.5°C).

Temperature

In Charleston, the average high-temperature in September marginally drops, from 84.6°F (29.2°C) in August, to a still moderately hot 77.9°F (25.5°C). In Charleston, West Virginia, the average low-temperature is 56.7°F (13.7°C).

Humidity

The average relative humidity in Charleston is 77%.

Rainfall

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

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day in Charleston is 12.4h.

Sunshine

The average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in Charleston is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Charleston?

In September, in Charleston, the average high-temperature is 77.9°F (25.5°C), and the average low-temperature is 56.7°F (13.7°C).

What is the average humidity in September in Charleston?

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

How many days does it rain in September in Charleston?

In Charleston, West Virginia, in September, during 13.9 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

What is the driest month in Charleston?

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

Does it snow in Charleston in September?

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

When it does not snow in Charleston?

In Charleston snow does not fall in June through September.

What is the average length of the day in September in Charleston?

The average length of the day in September in Charleston is 12.4h.

How long on average sun shines in September in Charleston?

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

How high is the UV index in September in Charleston?

In Charleston, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Charleston, West VA
  • Average high temperature in September: 25.5°C

The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is January (3.7°C).

  • Average low temperature in September: 13.7°C

The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is January (-3.7°C).

Average humidity in September - Charleston, West VA
  • Average humidity in September: 77%

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

Average rainfall in September - Charleston, West VA
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is May (100mm).
The driest month (with the least rainfall) is September (46mm).

Average rainfall days in September - Charleston, West VA
  • 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).

Average snowfall in September - Charleston, West VA
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (140mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - Charleston, West VA
  • Average snowfall days in September: 0 days

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

Average daylight in September / Average sunshine in September - Charleston, West VA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 8.3h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3.7h).

Average UV index in September - Charleston, West VA
  • Average UV index in September: 4

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