September weather forecast and climate
Colonial Village, DC

The first month of the autumn, September, is still a warm month in Colonial Village, District of Columbia, with average temperature fluctuating between 78.4°F (25.8°C) and 61.9°F (16.6°C).

Temperature

In Colonial Village, the average high-temperature marginally drops, from 85.8°F (29.9°C) in August, to a still moderately hot 78.4°F (25.8°C). In September, in Colonial Village, the average low-temperature is 61.9°F (16.6°C).

Humidity

In Colonial Village, the average relative humidity is 74%.

Rainfall

In Colonial Village, during 12.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. In Colonial Village, District of Columbia, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.

Snowfall

April through November are months without snowfall in Colonial Village.

Daylight

In September, the average length of the day in Colonial Village is 12.4h.

Sunshine

In September, the average sunshine is 9h.

UV index

In Colonial Village, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Colonial Village?

The average high-temperature, in September, is 78.4°F (25.8°C), while the average low-temperature is 61.9°F (16.6°C).

What is the average humidity in September in Colonial Village?

The average relative humidity in September in Colonial Village is 74%.

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

In Colonial Village, during September, the rain falls for 12.5 days and regularly aggregates up to 1.85" (47mm) of precipitation.

When it does not snow in Colonial Village?

April through November are months without snowfall in Colonial Village, District of Columbia.

What is the average length of the day in September in Colonial Village?

In September, the average length of the day in Colonial Village is 12.4h.

How long on average sun shines in September in Colonial Village?

The average sunshine in September is 9h.

What is the UV index reading in September in Colonial Village?

The average daily maximum UV index in September in Colonial Village is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Colonial Village, DC
  • Average high temperature in September: 78.4°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

Average pressure in September - Colonial Village, DC
  • Average pressure in September: 30.05"

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

Average wind speed in September - Colonial Village, DC
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in September - Colonial Village, DC
  • Average humidity in September: 74%

The month with the highest relative humidity is May (76%).
Months with the lowest relative humidity are April and July (71%).

Average rainfall in September - Colonial Village, DC
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").

Average rainfall days in September - Colonial Village, DC
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).

Average snowfall in September - Colonial Village, DC
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.17").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September - Colonial Village, DC
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and February (3.8 days).
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 - Colonial Village, DC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.1).

Average sunshine days in September - Colonial Village, DC
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).

Average UV index in September - Colonial Village, DC
  • 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).

Average cloud cover in September - Colonial Village, DC
  • 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).

Average visibility in September - Colonial Village, DC
  • Average visibility in September: 6mi

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).