Arlington County (Arlington)
September
Weather in Arlington County, Virginia for September 2026
Your guide to Arlington County weather in September - trends and predictions
So far, September 2026 in Arlington County shows a warmer trend than usual by 2.4 °F.
The forecast for the next days in Arlington County predicts temperatures to be around 21 °F, close to the historical average.
In general, the average temperature in Arlington County at the beginning of September is 30.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.1 °F by the end of September.
Arlington County experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 207.1 mm.
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Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
69 %
Avg humidity
Arlington County Weather September
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Temperatures trend during September in Arlington County
See the weather trend as well as the moving average line
September weather in Arlington County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /19° | 0.3 mm | 7 | |
| Sept. 2 | Sunny | 29° /18° | 2.1 mm | 7 | |
| Sept. 3 | Sunny | 31° /17° | 0 mm | 7 | |
| Sept. 4 |  Patchy rain possible | 33° /18° | 1.7 mm | 7 | |
| Sept. 5 | Sunny | 32° /19° | 1.9 mm | 7 | |
| Sept. 6 | Sunny | 32° /19° | 7.6 mm | 8 | |
| Sept. 7 |  Thundery outbreaks possible | 28° /18° | 6.3 mm | 7 | |
| Sept. 8 | Sunny | 29° /15° | 1.5 mm | 7 | |
| Sept. 9 | Light rain shower | 28° /15° | 1.5 mm | 6 | |
| Sept. 10 | Light rain shower | 29° /18° | 3.4 mm | 6 | |
| Sept. 11 | Patchy rain possible | 29° /17° | 11.1 mm | 6 | |
| Sept. 12 | Sunny | 29° /18° | 2.1 mm | 6 | |
| Sept. 13 |  Partly cloudy | 29° /18° | 2.4 mm | 6 | |
| Sept. 14 | Sunny | 28° /17° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 28° /15° | 0 mm | 7 | |
| Sept. 16 |  Overcast | 26° /15° | 2.8 mm | 6 | |
| Sept. 17 |  Moderate or heavy rain shower | 23° /16° | 24 mm | 5 | |
| Sept. 18 |  Light rain | 26° /18° | 10.5 mm | 5 | |
| Sept. 19 | Partly cloudy | 26° /17° | 0 mm | 7.3 | |
| Sept. 20 | Patchy rain possible | 28° /20° | 0.9 mm | 4.6 | |
| Sept. 21 | Patchy rain possible | 26° /20° | 0.3 mm | 5 | |
| Sept. 22 | Light rain shower | 19° /14° | 6.4 mm | 4 | |
| Sept. 23 | Light rain shower | 16° /11° | 8.9 mm | 3 | |
| Sept. 24 | Light rain shower | 16° /14° | 5.5 mm | 4 | |
| Sept. 25 | Patchy rain possible | 18° /13° | 1 mm | 4 | |
| Sept. 26 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 27 | Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 28 | Overcast | 18° /14° | 0 mm | 5 | |
| Sept. 29 | Overcast | 24° /15° | 0 mm | 6 | |
| Sept. 30 | Overcast | 23° /15° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Arlington County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Arlington County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Arlington County in September - FAQ
What are the expected maximum and minimum temperatures in Arlington County during September?
During September, expect a variety of temperatures with highs around 26° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Arlington County during September?
Significant rainfall exceeding 207.1 mm is expected in Arlington County during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Arlington County during September?
The average wind speed in Arlington County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Arlington County
Explore the daily rainfall trends and prepare for Arlington Countys September weather 💧
Typically, Arlington County has 21 rainy days in September with a total of 207.1 mm of rainfall.
UV exposure in Arlington County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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