September weather forecast
Foster, VA

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Weather in September

The first month of the autumn, September, is still a warm month in Foster, Virginia, with an average temperature varying between 66.6°F (19.2°C) and 79.9°F (26.6°C).

Temperature

As August transitions into September, Foster sees a gentle drop in the average high-temperature, transitioning from a moderately hot 85.6°F (29.8°C) to a still warm 79.9°F (26.6°C). September brings an average low-temperature of 66.6°F (19.2°C) to Foster.

Humidity

The average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 13 days and accumulates 2.4" (61mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In Foster, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:36 am and sunset at 7:34 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:49 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transforms into the following instructions:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.

Frequently asked questions

What are the temperatures in September?

In Foster, 79.9°F (26.6°C) is the average high-temperature and 66.6°F (19.2°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 95°F (35°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 13 days and accumulates 2.4" (61mm) of precipitation.

How many days does it rain in September?

In September, the rain falls for 13 days. Throughout September, 2.4" (61mm) of precipitation is accumulated.

When it does not snow?

In Foster, snow does not fall in April through October.

How many hours of daylight does Foster have in September?

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

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:36 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:49 pm EDT.

How long on average sun shines in September in Foster?

In September, the average sunshine duration in Foster is 9.2h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
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
Foster, VA

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

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (45.1°F).

  • Average low temperature in September: 66.6°F

The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).

Average pressure in September
Foster, VA

Average pressure in September - Foster, VA
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Foster, VA

Average wind speed in September - Foster, VA
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).

Average humidity in September
Foster, VA

Average humidity in September - Foster, VA
  • Average humidity in September: 75%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).

Average rainfall in September
Foster, VA

Average rainfall in September - Foster, VA
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is September (2.4").

Average rainfall days in September
Foster, VA

Average rainfall days in September - Foster, VA
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is November (9.6 days).

Average snowfall in September
Foster, VA

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

The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Foster, VA

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

The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Foster, VA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

Average sunshine days in September
Foster, VA

Average sunshine days in September - Foster, VA
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (11.5 days).

Average UV index in September
Foster, VA

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

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September
Foster, VA

Average cloud cover in September - Foster, 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).

Average visibility in September
Foster, VA

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

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

Foster, Virginia, USA

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