Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The advent of September brings a slight shift in average high-temperature, moving from a warm 85.5°F (29.7°C) in August to a still moderately hot 79°F (26.1°C). An average temperature of 62.2°F (16.8°C) is recorded during the nights in September.Humidity
In September, the average relative humidity is 77%.Rainfall
The month with the least rainfall in Dahlgren is September, when the rain falls for 13.3 days and typically collects 1.97" (50mm) of precipitation.Snowfall
In Dahlgren, Virginia, snow does not fall in May through October.Ocean temperature
In September, the average ocean temperature in Dahlgren is 74.8°F (23.8°C).Note: Swimming in 74.8°F (23.8°C) can be enjoyable or not, depending on how you feel about the cold and conditions such as sunshine, wind, and the day's temperature. FYI: Olympic standards dictate waters of 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 the month, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm EDT.
Sunshine
In Dahlgren, Virginia, the average sunshine in September is 8.8h.UV index
In Dahlgren, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Stay aware! UV radiation is magnified when reflecting off sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Dahlgren?
What is the average humidity in September in Dahlgren?
What is the driest month in Dahlgren?
How much does it rain in Dahlgren in September?
When it does not snow in Dahlgren?
What is the ocean temperature in September in Dahlgren?
How many hours of daylight does Dahlgren have in September?
What time are sunrise and sunset in September in Dahlgren?
How many hours of sunshine does Dahlgren have in September?
What is the UV index intensity in September in Dahlgren?
Average temperature in September
Dahlgren, 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).
Average pressure in September
Dahlgren, 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
Dahlgren, 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).
Average humidity in September
Dahlgren, 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%).
Average rainfall in September
Dahlgren, 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").
Average rainfall days in September
Dahlgren, 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).
Average snowfall in September
Dahlgren, 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").
Average snowfall days in September
Dahlgren, 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).
Average sea temperature in September
Dahlgren, VA
- Average sea temperature in September: 74.8°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 (46.7°F).
Average daylight in September /
Average sunshine in September
Dahlgren, 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 36min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Dahlgren, 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).
Average UV index in September
Dahlgren, 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).
Average cloud cover in September
Dahlgren, 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).
Average visibility in September
Dahlgren, 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).
Dahlgren, Virginia, USA
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