September weather forecast
Colchester, VA

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Weather in September

The first month of the autumn, September, is still a warm month in Colchester, Virginia, with temperature in the range of an average high of 79°F (26.1°C) and an average low of 61.3°F (16.3°C).

Temperature

As September commences, the average high-temperature subtly reduces, transitioning from a hot 86°F (30°C) in August to a moderately hot 79°F (26.1°C). During the month of September, the nighttime temperature in Colchester falls to an average of 61.3°F (16.3°C).

Humidity

The average relative humidity in September in Colchester, Virginia, is 76%.

Rainfall

In September, the rain falls for 12.6 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. In Colchester, Virginia, during the entire year, the rain falls for 164.3 days and collects up to 32.32" (821mm) of precipitation.

Snowfall

May through November are months without snowfall in Colchester.

Daylight

In Colchester, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:38 pm. On the last day of September, in Colchester, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

In Colchester, Virginia, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 5 in September transforms into this advice:
Take precautions - Protection against sunburn is recommended. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
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Frequently asked questions

What is the usual temperature for Colchester in September?

The average high-temperature, in September, in Colchester, is 79°F (26.1°C), while the average low-temperature is 61.3°F (16.3°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 96.8°F (36°C).

What is the average humidity in September in Colchester?

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

How much does it rain in Colchester in September?

In September, in Colchester, Virginia, the rain falls for 12.6 days. Throughout September, 2.13" (54mm) of precipitation is accumulated.

When it does not snow in Colchester?

May through November are months without snowfall in Colchester.

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

In September, the average day length in Colchester, Virginia, is 12h and 26min.

When are sunrise and sunset in September in Colchester?

On the first day of September in Colchester, Virginia, sunrise is at 6:38 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.

How long on average sun shines in September in Colchester?

In Colchester, the average sunshine duration in September is 8.9h.

What is the UV index reading in September in Colchester?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Colchester, VA

Average temperature in September - Colchester, VA
  • Average high temperature in September: 79°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°F).

  • Average low temperature in September: 61.3°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).

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Average pressure in September
Colchester, VA

Average pressure in September - Colchester, 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 (29.95"Hg).

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Average wind speed in September
Colchester, VA

Average wind speed in September - Colchester, VA
  • Average wind speed in September: 5.3mph

The windiest months (with the highest average wind speed) are March and April (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Colchester, VA

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

The months with the highest relative humidity are May, October and December (77%).
The months with the lowest relative humidity are April and July (72%).

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Average rainfall in September
Colchester, VA

Average rainfall in September - Colchester, VA
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (2.01").

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Average rainfall days in September
Colchester, VA

Average rainfall days in September - Colchester, VA
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is November (9.1 days).

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Average snowfall in September
Colchester, VA

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

The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days in September
Colchester, VA

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

The month with the highest number of snowfall days is January (4.8 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
Colchester, VA

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h and 5min

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

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Average sunshine days in September
Colchester, VA

Average sunshine days in September - Colchester, VA
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (10.6 days).

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Average UV index in September
Colchester, VA

Average UV index in September - Colchester, 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, November and December (UV index 2).

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Average cloud cover in September
Colchester, VA

Average cloud cover in September - Colchester, VA
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Colchester, VA

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

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

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Colchester, Virginia, USA

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