September weather forecastArrington, VA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Arrington, Virginia, with an average temperature varying between 56.8°F (13.8°C) and 77.4°F (25.2°C).Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from 84.2°F (29°C) in August to a still warm 77.4°F (25.2°C). During September, Arrington sees a mean low-temperature of 56.8°F (13.8°C).Humidity
The months with the highest humidity are May, September, October and December, with an average relative humidity of 77%.Rainfall
September is the month with the least rainfall in Arrington. Rain falls for 12.7 days and accumulates 1.97" (50mm) of precipitation.Snowfall
In Arrington, snow does not fall in May through September.Daylight
In September, the average length of the day in Arrington is 12h and 25min.On the first day of September in Arrington, sunrise is at 6:46 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:59 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Arrington, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during September translates into the following guidance:
Heed the precautions - It is counselled to guard against solar damage. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Arrington, VA
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (40.8°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Arrington, VA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Arrington, VA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Arrington, VA
- Average humidity in September: 77%
The months with the highest relative humidity are May, September, October and December (77%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Arrington, VA
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in September
Arrington, VA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Arrington, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.9").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Arrington, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Arrington, VA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Arrington, VA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in September
Arrington, VA
- Average UV index in September: 4
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, November and December (UV index 2).
Average cloud cover in September
Arrington, VA
- Average cloud cover in September: 39
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Arrington, VA
- Average visibility in September: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
