Weather in Arlington, Virginia for September 2025
Until now, September 2025 in Arlington is cooler than usual, with temperatures averaging 26.6 °F, this is -2.3 °F below the typical seasonal average.
Expect cooler weather in the next days in Arlington with the forecast suggesting a temperature of 27.2 °F, lower than the historical average.
In general, the average temperature in Arlington at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 26.6 °F by the end of September.
Arlington in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 196.8 mm.
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Arlington Weather September
Temperatures trend during September in Arlington
September weather in Arlington day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /17° | 0.4 mm | 7 | |
| Sept. 2 | Sunny | 27° /16° | 0 mm | 7 | |
| Sept. 3 |  Partly cloudy | 28° /16° | 0 mm | 7 | |
| Sept. 4 |  Patchy rain possible | 31° /18° | 1.7 mm | 7 | |
| Sept. 5 | Sunny | 32° /19° | 2.5 mm | 8 | |
| Sept. 6 | Sunny | 32° /20° | 10.2 mm | 7 | |
| Sept. 7 |  Thundery outbreaks possible | 27° /18° | 8.4 mm | 6 | |
| Sept. 8 | Sunny | 27° /15° | 1.9 mm | 7 | |
| Sept. 9 | Light rain shower | 27° /15° | 1.9 mm | 7 | |
| Sept. 10 | Light rain shower | 28° /16° | 4.2 mm | 6 | |
| Sept. 11 | Patchy rain possible | 30° /16° | 0.4 mm | 7 | |
| Sept. 12 | Sunny | 29° /17° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 29° /17° | 1.5 mm | 7 | |
| Sept. 14 | Sunny | 33° /19° | 0 mm | 1.5 | |
| Sept. 15 |  Overcast | 27° /20° | 0 mm | 1.3 | |
| Sept. 16 |  Heavy rain | 19° /18° | 21.2 mm | 1.2 | |
| Sept. 17 |  Moderate rain | 20° /17° | 6.4 mm | 0.2 | |
| Sept. 18 | Patchy rain possible | 26° /19° | 2 mm | 0 | |
| Sept. 19 | Sunny | 31° /18° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 27° /18° | 0 mm | 6 | |
| Sept. 21 | Sunny | 24° /15° | 0 mm | 5 | |
| Sept. 22 | Sunny | 25° /15° | 0 mm | 5 | |
| Sept. 23 | Sunny | 31° /17° | 0 mm | 6 | |
| Sept. 24 | Patchy rain possible | 26° /19° | 0.7 mm | 5 | |
| Sept. 25 | Sunny | 31° /19° | 0 mm | 6 | |
| Sept. 26 | Patchy rain possible | 30° /22° | 0.2 mm | 5 | |
| Sept. 27 | Patchy rain possible | 31° /20° | 0.4 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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Arlington in September - FAQ
September rainfall patterns in Arlington
UV exposure in Arlington during September
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