September weather forecast
Colonial Beach, VA

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Weather in September

September, the first month of the autumn in Colonial Beach, is also a moderately hot month, with an average temperature varying between 62.2°F (16.8°C) and 79°F (26.1°C).

Temperature

During the shift to September, a minor reduction in average high-temperature is observed, shifting from 85.5°F (29.7°C) in August to a still moderately hot 79°F (26.1°C). Colonial Beach reports an average nighttime low-temperature of 62.2°F (16.8°C) in September.

Humidity

In Colonial Beach, the average relative humidity in September is 77%.

Rainfall

September is the month with the least rainfall in Colonial Beach, Virginia. Rain falls for 13.3 days and accumulates 1.97" (50mm) of precipitation.

Snowfall

In Colonial Beach, Virginia, snow does not fall in May through October.

Ocean temperature

In September, the average ocean temperature in Colonial Beach is 74.8°F (23.8°C).
Note: Given an individual's cold sensitivity, considering factors like sunshine, wind, and air temperature, a brief swim in 74.8°F (23.8°C) water might be pleasurable. (FYI: The standard water temperature for Olympic swimming contests is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

Sunshine

In September, the average sunshine in Colonial Beach is 8.8h.

UV index

In Colonial Beach, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A typical high UV index of 5 in September suggests the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Attention! The reflection of both water and sand can increase the intensity of UV rays.
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Frequently asked questions

What are September temperatures in Colonial Beach?

In Colonial Beach, in September, the average high-temperature is 79°F (26.1°C), and the average low-temperature is 62.2°F (16.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is computed to be 95°F (35°C).

What is the average humidity in September in Colonial Beach?

In Colonial Beach, the average relative humidity in September is 77%.

What is the driest month in Colonial Beach?

The month with the least rainfall in Colonial Beach is September, when the rain falls for 13.3 days and typically collects 1.97" (50mm) of precipitation.

How many days does it rain in September in Colonial Beach?

In Colonial Beach, Virginia, during September, the rain falls for 13.3 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When it does not snow in Colonial Beach?

May through October are months without snowfall.

How warm is the water in September in Colonial Beach?

In September, the average ocean temperature in Colonial Beach, Virginia, is 74.8°F (23.8°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.8°F (23.8°C) water may be enjoyable.

How many hours of daylight does Colonial Beach have in September?

The average day length in September in Colonial Beach, Virginia, is 12h and 25min.

When are sunrise and sunset in September in Colonial Beach?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of the month, in Colonial Beach, sunrise is at 7:03 am and sunset at 6:51 pm EDT.

How many hours of sunshine does Colonial Beach have in September?

In September, the average sunshine duration is 8.8h.

How high is the UV index in September in Colonial Beach?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
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
Colonial Beach, VA

Average temperature in September - Colonial Beach, VA
  • Average high temperature in September: 79°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (42.3°F).

  • Average low temperature in September: 62.2°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

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Average pressure in September
Colonial Beach, VA

Average pressure in September - Colonial Beach, 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
Colonial Beach, VA

Average wind speed in September - Colonial Beach, VA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in September
Colonial Beach, VA

Average humidity in September - Colonial Beach, VA
  • Average humidity in September: 77%

The months with the highest relative humidity are May and December (78%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in September
Colonial Beach, VA

Average rainfall in September - Colonial Beach, VA
  • Average rainfall in September: 1.97"

The wettest months (with the highest rainfall) are July and August (3.19").
The driest month (with the least rainfall) is September (1.97").

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Average rainfall days in September
Colonial Beach, VA

Average rainfall days in September - Colonial Beach, VA
  • Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (9.4 days).

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Average snowfall in September
Colonial Beach, VA

Average snowfall in September - Colonial Beach, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Colonial Beach, VA

Average snowfall days in September - Colonial Beach, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Colonial Beach, VA

Average sea temperature in September - Colonial Beach, VA
  • Average sea temperature in September: 74.9°F

The best month for swimming (with the highest average sea temperature) is August (78.4°F).
The coldest month (with the lowest average sea temperature) is February (47.1°F).

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Average daylight in September /
Average sunshine in September
Colonial Beach, VA

Average daylight in September / Average sunshine in September - Colonial Beach, 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 36min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).

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Average sunshine days in September
Colonial Beach, VA

Average sunshine days in September - Colonial Beach, VA
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.9 days).

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Average UV index in September
Colonial Beach, VA

Average UV index in September - Colonial Beach, 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 and December (UV index 2).

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Average cloud cover in September
Colonial Beach, VA

Average cloud cover in September - Colonial Beach, VA
  • Average cloud cover in September: 38

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Colonial Beach, VA

Average visibility in September - Colonial Beach, 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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Colonial Beach, Virginia, USA

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