Loudoun County (Leesburg)
September
Weather in Loudoun County, Virginia for September 2025
Your guide to Loudoun County weather in September - trends and predictions
In general, the average temperature in Loudoun County at the beginning of September is 24.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 22.6 °F by the end of September.
The climate of Loudoun County in September is notably wet, with an average of 14 rainy days, and a total of 123.2 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
14
Rainy days
0
Snow days
24°/15°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
Loudoun County Weather September
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Temperatures trend during September in Loudoun County
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September weather in Loudoun County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Moderate or heavy rain shower | 27° /20° | 6.7 mm | 6 | |
| Sept. 2 |  Partly cloudy | 24° /15° | 0 mm | 6 | |
| Sept. 3 |  Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 4 |  Overcast | 24° /11° | 0 mm | 5 | |
| Sept. 5 | Partly cloudy | 25° /12° | 0 mm | 7 | |
| Sept. 6 | Overcast | 26° /13° | 0 mm | 6 | |
| Sept. 7 |  Heavy rain at times | 21° /14° | 3.5 mm | 5 | |
| Sept. 8 | Sunny | 22° /9° | 0 mm | 6 | |
| Sept. 9 | Sunny | 25° /9° | 0 mm | 7 | |
| Sept. 10 | Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 11 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 12 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 13 |  Patchy rain possible | 26° /15° | 0.2 mm | 6 | |
| Sept. 14 | Overcast | 28° /16° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 16 | Overcast | 23° /12° | 1.8 mm | 5 | |
| Sept. 17 | Moderate or heavy rain shower | 22° /17° | 12.4 mm | 5 | |
| Sept. 18 | Moderate or heavy rain shower | 22° /17° | 12 mm | 5 | |
| Sept. 19 | Overcast | 25° /16° | 0 mm | 6 | |
| Sept. 20 | Overcast | 28° /12° | 0 mm | 6 | |
| Sept. 21 | Patchy rain possible | 26° /17° | 5.7 mm | 6 | |
| Sept. 22 | Patchy rain possible | 21° /18° | 5.1 mm | 5 | |
| Sept. 23 | Moderate rain at times | 22° /17° | 4.9 mm | 5 | |
| Sept. 24 | Moderate or heavy rain shower | 19° /16° | 23 mm | 4 | |
| Sept. 25 | Moderate rain at times | 22° /18° | 3.5 mm | 5 | |
| Sept. 26 | Patchy rain possible | 27° /21° | 2.6 mm | 6 | |
| Sept. 27 | Moderate or heavy rain shower | 23° /20° | 33.5 mm | 5 | |
| Sept. 28 | Patchy rain possible | 26° /20° | 4.1 mm | 6 | |
| Sept. 29 | Heavy rain at times | 22° /19° | 4.3 mm | 5 | |
| Sept. 30 | Overcast | 19° /16° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Loudoun 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 Loudoun County forecast closer to your planned date for the most up-to-date weather information.
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Loudoun County in September - FAQ
What are the expected maximum and minimum temperatures in Loudoun County during September?
During September, expect a variety of temperatures with highs around 24° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Loudoun County during September?
Significant rainfall exceeding 123.2 mm is expected in Loudoun 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 Loudoun County during September?
The average wind speed in Loudoun County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Loudoun County
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UV exposure in Loudoun County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Loudoun County?Get accurate weather forecasts for Loudoun County, located at latitude 39.116 and longitude -77.564. Stay updated with localized weather information tailored for Loudoun County.
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