September weather forecast
Dale City, VA

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Weather in September

September, the first month of the autumn in Dale City, is still a warm month, with an average temperature varying between 61°F (16.1°C) and 79.2°F (26.2°C).

Temperature

September's arrival signals a moderate reduction in the average high-temperature, easing from a hot 86°F (30°C) in August to a moderately hot 79.2°F (26.2°C). In September, Dale City records an average nighttime temperature of 61°F (16.1°C).

Humidity

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

Rainfall

In Dale City, in September, it is raining for 8.8 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 105.2 rainfall days, and 9.21" (234mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In Dale City, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:53 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.

Frequently asked questions

What is the usual temperature for Dale City in September?

In Dale City, 79.2°F (26.2°C) is the average high-temperature and 61°F (16.1°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 96.8°F (36°C).

What is the average humidity in September?

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

How many days does it rain in September?

In Dale City, in September, it is raining for 8.8 days, with typically 0.51" (13mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:53 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.9h.

How high is the UV index in September?

In Dale City, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
Dale City, VA

Average temperature in September - Dale City, VA
  • Average high temperature in September: 79.2°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 (41°F).

  • Average low temperature in September: 61°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (27°F).

Average pressure in September
Dale City, VA

Average pressure in September - Dale City, 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).

Average wind speed in September
Dale City, VA

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

The windiest months (with the highest average wind speed) are March and April (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in September
Dale City, VA

Average humidity in September - Dale City, VA
  • Average humidity in September: 76%

The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (72%).

Average rainfall in September
Dale City, VA

Average rainfall in September - Dale City, VA
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is August (1.18").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in September
Dale City, VA

Average rainfall days in September - Dale City, VA
  • Average rainfall days in September: 8.8 days

The month with the highest number of rainy days is May (11.7 days).
The month with the least rainy days is November (5.5 days).

Average snowfall in September
Dale City, VA

Average snowfall in September - Dale City, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.83").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Dale City, VA

Average snowfall days in September - Dale City, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Dale City, VA

Average daylight in September / Average sunshine in September - Dale City, 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).

Average sunshine days in September
Dale City, VA

Average sunshine days in September - Dale City, VA
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is November (23.1 days).
The month with the least sunshine days is May (16.9 days).

Average UV index in September
Dale City, VA

Average UV index in September - Dale City, 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).

Average cloud cover in September
Dale City, VA

Average cloud cover in September - Dale City, VA
  • Average cloud cover in September: 37

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
Dale City, VA

Average visibility in September - Dale City, 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).

Dale City, Virginia, USA

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