September weather forecast
Williamsburg, VA

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Over 50 percent of Williamsburg Virginia covered in green and dense forests
Over 50 percent of Williamsburg Virginia covered in green and dense forests

Weather in September

September marks the arrival of fall in Williamsburg, welcoming cooler temperatures ranging from 65.1°F (18.4°C) to 79.9°F (26.6°C). This month witnesses a significant drop in rainfall to only 1.57" (40mm), giving way to drier conditions. The onset of autumn decorates the city with an array of colors, underlined by 12.4 daylight hours that highlight its beauty. Winds pick up slightly, bringing a refreshing change with them. September is a month of transition in Williamsburg, where the beauty of fall begins to unfold against the backdrop of decreasing temperatures.

Temperature

Williamsburg observes a small decrease in the average high-temperature with the arrival of September, falling from August's tropical 86.5°F (30.3°C) to a warm 79.9°F (26.6°C). The low-temperature in Williamsburg, Virginia, averages to a refreshing 65.1°F (18.4°C) during the nights of September.

Humidity

In September, the average relative humidity in Williamsburg is 76%.

Rainfall

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

Snowfall

In Williamsburg, Virginia, snow does not fall in April through October.

Daylight

In September, the average length of the day in Williamsburg, Virginia, is 12h and 25min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:35 pm. On the last day of September, in Williamsburg, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

Sunshine

In Williamsburg, the average sunshine in September is 9.2h.

UV index

In Williamsburg, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Heed the precautions - It is counselled to guard against solar damage. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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Frequently asked questions

What is the usual temperature for Williamsburg in September?

An average high-temperature, in September, in Williamsburg, is 79.9°F (26.6°C) and the average low-temperature is 65.1°F (18.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 98.6°F (37°C).

What is the average humidity in September in Williamsburg?

The average relative humidity in September is 76%.

How much does it rain in Williamsburg in September?

In Williamsburg, during September, the rain falls for 12.7 days and regularly aggregates up to 1.57" (40mm) of precipitation.

When it does not snow in Williamsburg?

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

How many hours of daylight does Williamsburg have in September?

The average day length in September in Williamsburg is 12h and 25min.

When are sunrise and sunset in September in Williamsburg?

On the first day of September, sunrise is at 6:37 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm EDT.

How many hours of sunshine does Williamsburg have in September?

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

What is the UV index reading in September in Williamsburg?

In Williamsburg, Virginia, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe 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
Williamsburg, VA

Average temperature in September - Williamsburg, 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
Williamsburg, VA

Average pressure in September - Williamsburg, VA
  • Average pressure in September: 30.04"Hg

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

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Average wind speed in September
Williamsburg, VA

Average wind speed in September - Williamsburg, 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
Williamsburg, VA

Average humidity in September - Williamsburg, 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
Williamsburg, VA

Average rainfall in September - Williamsburg, 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
Williamsburg, VA

Average rainfall days in September - Williamsburg, 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
Williamsburg, VA

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

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

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Average snowfall days in September
Williamsburg, VA

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

The month with the highest number of snowfall days is January (3.1 days).
The 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
Williamsburg, VA

Average daylight in September / Average sunshine in September - Williamsburg, 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 18min).

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Average sunshine days in September
Williamsburg, VA

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

The 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
Williamsburg, VA

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

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

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Average cloud cover in September
Williamsburg, VA

Average cloud cover in September - Williamsburg, 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
Williamsburg, VA

Average visibility in September - Williamsburg, 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).

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Williamsburg, Virginia, USA

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