September weather forecast
Jamestown, VA

Weather in September

The first month of the autumn, September, is still a warm month in Jamestown, Virginia, with average temperature fluctuating between 79.9°F (26.6°C) and 65.1°F (18.4°C).

Temperature

In Jamestown, the average high-temperature marginally drops, from a hot 86.5°F (30.3°C) in August, to a moderately hot 79.9°F (26.6°C). In Jamestown, the average low-temperature is 65.1°F (18.4°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Jamestown, during September, the rain falls for 12.7 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, in Jamestown, there are 148.7 rainfall days, and 20.35" (517mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in Jamestown is 12.4h.

Sunshine

In September, the average sunshine is 9.2h.

UV index

The average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Jamestown?

In September, the average relative humidity is 76%.

How much does it rain in Jamestown in September?

In Jamestown, in September, it is raining for 12.7 days, with typically 1.57" (40mm) of accumulated precipitation.

When it does not snow in Jamestown?

April through October are months without snowfall in Jamestown.

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

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

How many hours of sunshine does Jamestown have in September?

In Jamestown, Virginia, the average sunshine in September is 9.2h.

What is the UV index reading in September in Jamestown?

In September, the average daily maximum UV index in Jamestown, Virginia, is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Jamestown, VA

Average temperature in September - Jamestown, VA
  • Average high temperature in September: 79.9°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in September: 65.1°F

The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).

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Average pressure in September
Jamestown, VA

Average pressure in September - Jamestown, VA
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

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Average wind speed in September
Jamestown, VA

Average wind speed in September - Jamestown, VA
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in September
Jamestown, VA

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

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (73%).

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Average rainfall in September
Jamestown, VA

Average rainfall in September - Jamestown, VA
  • Average rainfall in September: 1.57"

The wettest month (with the highest rainfall) is August (2.36").
The driest months (with the least rainfall) are October and December (1.38").

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Average rainfall days in September
Jamestown, VA

Average rainfall days in September - Jamestown, VA
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is August (16.3 days).
The month with the least rainy days is November (8.5 days).

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Average snowfall in September
Jamestown, VA

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

The month with the highest snowfall is February (0.87").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Jamestown, VA

Average snowfall days in September - Jamestown, VA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is January (3.1 days).
Months with the least snowfall days are May, June, July, August and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 5.3h).

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Average sunshine days in September
Jamestown, VA

Average sunshine days in September - Jamestown, VA
  • Average sunshine days in September: 14.7 days

Months with the most sunshine days are October and November (19.7 days).
The month with the least sunshine days is August (12.2 days).

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Average UV index in September
Jamestown, VA

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

The month with the highest UV index is June (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Jamestown, VA

Average cloud cover in September - Jamestown, VA
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in September
Jamestown, VA

Average visibility in September - Jamestown, VA
  • Average visibility in September: 6mi

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

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