Arlington County
September
Weather in Arlington County for September 2025
Your guide to Arlington County weather in September - trends and predictions
In general, the average temperature in Arlington County at the beginning of September is 30.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.6 °F by the end of September.
The climate of Arlington County in September is notably wet, with an average of 14 rainy days.
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16
Dry days
14
Rainy days
0
Snow days
27°/16°
Temperatures
13 km/h
Avg max wind
69 %
Avg humidity
Arlington County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2 28° | 3  30° | 4  31° | 5 32° | 6 32° | 7  29° |
| 8 28° | 9 29° | 10 30° | 11 31° | 12  29° | 13 28° | 14 27° |
| 15 27° | 16 26° | 17  21° | 18  22° | 19 23° | 20 27° | 21 26° |
| 22 22° | 23 20° | 24 19° | 25 21° | 26 22° | 27 21° | 28  24° |
| 29  22° | 30 22° |
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Temperatures trend during September in Arlington County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 29° /17° | 0.5 mm | 7 | |
| Sept. 2 | Sunny | 28° /16° | 0 mm | 8 | |
| Sept. 3 | Partly cloudy | 30° /15° | 0 mm | 8 | |
| Sept. 4 | Patchy rain possible | 31° /18° | 0.2 mm | 7 | |
| Sept. 5 | Sunny | 32° /19° | 0 mm | 8 | |
| Sept. 6 | Sunny | 32° /19° | 0.4 mm | 8 | |
| Sept. 7 | Thundery outbreaks possible | 29° /18° | 0.4 mm | 7 | |
| Sept. 8 | Partly cloudy | 28° /15° | 2.9 mm | 7 | |
| Sept. 9 | Light rain shower | 29° /15° | 2.9 mm | 7 | |
| Sept. 10 | Light rain shower | 30° /16° | 6.3 mm | 7 | |
| Sept. 11 | Patchy rain possible | 31° /17° | 0.6 mm | 8 | |
| Sept. 12 | Mist | 29° /18° | 0 mm | 7 | |
| Sept. 13 | Light rain shower | 28° /17° | 2.2 mm | 7 | |
| Sept. 14 | Sunny | 27° /17° | 0 mm | 7 | |
| Sept. 15 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 16 | Sunny | 26° /14° | 5.6 mm | 6 | |
| Sept. 17 | Heavy rain | 21° /17° | 18.8 mm | 5 | |
| Sept. 18 | Light rain | 22° /17° | 19.5 mm | 5 | |
| Sept. 19 | Sunny | 23° /16° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 27° /16° | 0 mm | 7 | |
| Sept. 21 | Partly cloudy | 26° /17° | 12.4 mm | 6 | |
| Sept. 22 | Patchy rain possible | 22° /16° | 5.5 mm | 5 | |
| Sept. 23 | Heavy rain | 20° /15° | 34.2 mm | 5 | |
| Sept. 24 | Light rain shower | 19° /17° | 48.6 mm | 4 | |
| Sept. 25 | Patchy rain possible | 21° /16° | 3.3 mm | 5 | |
| Sept. 26 | Fog | 22° /18° | 7.5 mm | 5 | |
| Sept. 27 | Patchy rain possible | 21° /17° | 20 mm | 5 | |
| Sept. 28 | Overcast | 24° /16° | 2.8 mm | 6 | |
| Sept. 29 | Moderate or heavy rain shower | 22° /18° | 1.7 mm | 5 | |
| Sept. 30 | Patchy rain possible | 22° /16° | 0.6 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.
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 27° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Arlington County during September?
Significant rainfall exceeding 161.8 mm is expected in Arlington County during September, occurring over more than 14 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.
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