Fairfax County (Herndon)
October
Weather in Fairfax County, Virginia for October 2026
Your guide to Fairfax County weather in October - trends and predictions
In general, the average temperature in Fairfax County at the beginning of October is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.9 °C by the end of October.
Fairfax County experiences moderate rainfall in October, with an average of 9 rainy days and a total precipitation of 329.6 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
18°/10°
Temperatures
18 km/h
Avg max wind
67 %
Avg humidity
Fairfax County Weather October
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Temperatures trend during October in Fairfax County
See the weather trend as well as the moving average line
October weather in Fairfax County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Cloudy | 22° /15° | 0 mm | 5 | |
| Oct. 2 |  Overcast | 20° /10° | 0 mm | 5 | |
| Oct. 3 | Cloudy | 22° /13° | 0 mm | 5 | |
| Oct. 4 |  Partly cloudy | 27° /11° | 0 mm | 5 | |
| Oct. 5 | Partly cloudy | 27° /13° | 0 mm | 4 | |
| Oct. 6 |  Mist | 23° /15° | 0 mm | 3 | |
| Oct. 7 | Overcast | 25° /16° | 0.2 mm | 4 | |
| Oct. 8 |  Heavy rain | 21° /14° | 62.6 mm | 3 | |
| Oct. 9 |  Sunny | 18° /8° | 0 mm | 4 | |
| Oct. 10 | Overcast | 15° /4° | 0 mm | 4 | |
| Oct. 11 |  Moderate or heavy rain shower | 19° /13° | 8.2 mm | 2 | |
| Oct. 12 | Overcast | 16° /13° | 4.7 mm | 1 | |
| Oct. 13 |  Moderate rain | 12° /11° | 26.1 mm | 1 | |
| Oct. 14 |  Light rain | 17° /13° | 2.1 mm | 1 | |
| Oct. 15 | Partly cloudy | 19° /12° | 0 mm | 3 | |
| Oct. 16 | Sunny | 19° /5° | 0 mm | 3 | |
| Oct. 17 | Partly cloudy | 17° /6° | 0 mm | 3 | |
| Oct. 18 | Partly cloudy | 20° /9° | 0 mm | 3 | |
| Oct. 19 | Overcast | 23° /14° | 2 mm | 3 | |
| Oct. 20 | Overcast | 19° /10° | 6 mm | 3 | |
| Oct. 21 | Cloudy | 22° /8° | 0 mm | 3 | |
| Oct. 22 | Partly cloudy | 17° /9° | 0 mm | 3 | |
| Oct. 23 | Overcast | 15° /8° | 0 mm | 3 | |
| Oct. 24 | Partly cloudy | 14° /6° | 0 mm | 3 | |
| Oct. 25 | Cloudy | 14° /4° | 0 mm | 3 | |
| Oct. 26 | Overcast | 14° /5° | 0 mm | 1 | |
| Oct. 27 | Overcast | 11° /8° | 0 mm | 1 | |
| Oct. 28 | Overcast | 10° /5° | 0 mm | 1 | |
| Oct. 29 | Moderate or heavy rain shower | 10° /6° | 115.9 mm | 0 | |
| Oct. 30 |  Moderate or heavy rain with thunder | 14° /9° | 101.8 mm | 0 | |
| Oct. 31 | Sunny | 17° /6° | 0 mm | 2 | |
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Important Notice
Our weather forecast for Fairfax County in October 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 Fairfax County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Fairfax County in October - FAQ
What are the expected maximum and minimum temperatures in Fairfax County during October?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fairfax County during October?
Significant rainfall exceeding 329.6 mm is expected in Fairfax County during October, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Fairfax County during October?
The average wind speed in Fairfax County during October is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Fairfax County
Explore the daily rainfall trends and prepare for Fairfax Countys October weather 💧
Typically, Fairfax County has 9 rainy days in October with a total of 329.6 mm of rainfall.
UV exposure in Fairfax County during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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