September weather forecast
Commonwealth, VA

Weather in September

September, the first month of the autumn in Commonwealth, is still a warm month, with an average temperature ranging between max 78.6°F (25.9°C) and min 58.5°F (14.7°C).

Temperature

In Commonwealth, the average high-temperature in September marginally drops from a moderately hot 85.6°F (29.8°C) in August to a still warm 78.6°F (25.9°C). In Commonwealth, in September, the average low-temperature is 58.5°F (14.7°C).

Humidity

The months with the highest humidity are May, September, October and December, with an average relative humidity of 76%.

Rainfall

In Commonwealth, in September, it is raining for 14.1 days, with typically 2.05" (52mm) of accumulated precipitation. In Commonwealth, during the entire year, the rain falls for 155.9 days and collects up to 27.99" (711mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day in Commonwealth, Virginia, is 12h and 25min.
On the first day of September in Commonwealth, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:58 pm EDT.

Sunshine

The average sunshine in September in Commonwealth is 8.7h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What are the most humid months in Commonwealth?

May, September, October and December, with an average relative humidity of 76%, are most humid months in Commonwealth, Virginia.

What is the average humidity in September in Commonwealth?

In September, the average relative humidity is 76%.

How much does it rain in Commonwealth in September?

In Commonwealth, Virginia, during September, the rain falls for 14.1 days and regularly aggregates up to 2.05" (52mm) of precipitation.

When it does not snow in Commonwealth?

May through October are months without snowfall in Commonwealth.

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

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

When are sunrise and sunset in September in Commonwealth?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, in Commonwealth, sunrise is at 7:08 am and sunset at 6:58 pm EDT.

How long on average sun shines in September in Commonwealth?

In September, the average sunshine duration in Commonwealth is 8.7h.

What is the UV index reading in September in Commonwealth?

The average daily maximum UV index in September in Commonwealth is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Commonwealth, VA

Average temperature in September - Commonwealth, VA
  • Average high temperature in September: 78.6°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in September: 58.5°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in September
Commonwealth, VA

Average pressure in September - Commonwealth, VA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

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Average wind speed in September
Commonwealth, VA

Average wind speed in September - Commonwealth, VA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

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Average humidity in September
Commonwealth, VA

Average humidity in September - Commonwealth, VA
  • Average humidity in September: 76%

The months with the highest relative humidity are May, September, October and December (76%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in September
Commonwealth, VA

Average rainfall in September - Commonwealth, VA
  • Average rainfall in September: 2.05"

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is January (1.69").

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Average rainfall days in September
Commonwealth, VA

Average rainfall days in September - Commonwealth, VA
  • Average rainfall days in September: 14.1 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (8.9 days).

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Average snowfall in September
Commonwealth, VA

Average snowfall in September - Commonwealth, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Commonwealth, VA

Average snowfall days in September - Commonwealth, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Commonwealth, VA

Average daylight in September / Average sunshine in September - Commonwealth, VA
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 46min).
The month with the shortest days is December (Average daylight: 9h and 34min).

  • Average sunshine in September: 8h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Commonwealth, VA

Average sunshine days in September - Commonwealth, VA
  • Average sunshine days in September: 13.8 days

The month with the most sunshine days is December (19.9 days).
The month with the least sunshine days is May (11.4 days).

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Average UV index in September
Commonwealth, VA

Average UV index in September - Commonwealth, VA
  • Average UV index in September: 5

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, November and December (UV index 2).

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Average cloud cover in September
Commonwealth, VA

Average cloud cover in September - Commonwealth, VA
  • Average cloud cover in September: 39

The month with the most cloud cover is March (Cloud cover 45).
The months with the least cloud cover are June and July (Cloud cover 31).

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Average visibility in September
Commonwealth, VA

Average visibility in September - Commonwealth, VA
  • Average visibility in September: 5mi

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

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