Arlington County (Arlington)
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.
Arlington County in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 196.8 mm.
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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
26°/17°
Temperatures
13 km/h
Avg max wind
70 %
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 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 196.8 mm is expected in Arlington County during September, occurring over more than 16 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 💧
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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