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Fairfax County (Herndon)
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United States weather

Weather in Fairfax County, Virginia for August 2026

Your guide to Fairfax County weather in August - trends and predictions

    Temperatures

  • In general, the average temperature in Fairfax County at the beginning of August is 26.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 25.4 °F by the end of August.

    • Rain 🌧️

  • Fairfax County experiences moderate rainfall in August, with an average of 6 rainy days and a total precipitation of 81.9 mm.

    • More

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Average dry days
25
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/19°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
68 %
Avg humidity

Fairfax County Weather August

Move between months or click on a day
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
24°
2
Cloudy
26°
3
Mist
27°
4
Mist
32°
5
Overcast
24°
6
Overcast
27°
7
Overcast
24°
8
Mist
29°
9
Partly cloudy
30°
10
Sunny
32°
11
Partly cloudy
32°
12
Mist
34°
13
Thundery outbreaks possible
32°
14
Light rain shower
32°
15
Moderate or heavy rain shower
30°
16
Fog
32°
17
Thundery outbreaks possible
37°
18
Overcast
25°
19
Mist
24°
20
Mist
30°
21
Overcast
24°
22
Cloudy
30°
23
Sunny
30°
24
Overcast
28°
25
Mist
28°
26
Cloudy
26°
27
Partly cloudy
24°
28
Partly cloudy
25°
29
Cloudy
25°
30
Cloudy
26°
31
Overcast
24°

Temperatures trend during August in Fairfax County

See the weather trend as well as the moving average line

August weather in Fairfax County day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
Aug. 1 Light rain shower
Light rain shower
 24° /18° 32.2 mm 2
Aug. 2 Cloudy
Cloudy
 26° /17° 0 mm 9
Aug. 3 Mist
Mist
 27° /17° 0 mm 11
Aug. 4 Mist
Mist
 32° /18° 0 mm 11
Aug. 5 Overcast
Overcast
 24° /20° 0 mm 3
Aug. 6 Overcast
Overcast
 27° /21° 0 mm 6
Aug. 7 Overcast
Overcast
 24° /20° 0 mm 5
Aug. 8 Mist
Mist
 29° /19° 0 mm 11
Aug. 9 Partly cloudy
Partly cloudy
 30° /20° 0 mm 11
Aug. 10 Sunny
Sunny
 32° /20° 0 mm 11
Aug. 11 Partly cloudy
Partly cloudy
 32° /18° 0 mm 11
Aug. 12 Mist
Mist
 34° /22° 0 mm 11
Aug. 13 Thundery outbreaks possible
Thundery outbreaks possible
 32° /24° 0 mm 8
Aug. 14 Light rain shower
Light rain shower
 32° /23° 4.1 mm 10
Aug. 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /24° 31.4 mm 8
Aug. 16 Fog
Fog
 32° /23° 2 mm 9
Aug. 17 Thundery outbreaks possible
Thundery outbreaks possible
 37° /23° 0 mm 10
Aug. 18 Overcast
Overcast
 25° /18° 0.1 mm 2
Aug. 19 Mist
Mist
 24° /18° 0 mm 2
Aug. 20 Mist
Mist
 30° /19° 2.2 mm 5
Aug. 21 Overcast
Overcast
 24° /19° 9.8 mm 2
Aug. 22 Cloudy
Cloudy
 30° /19° 0 mm 10
Aug. 23 Sunny
Sunny
 30° /17° 0 mm 10
Aug. 24 Overcast
Overcast
 28° /20° 0.1 mm 9
Aug. 25 Mist
Mist
 28° /21° 0 mm 10
Aug. 26 Cloudy
Cloudy
 26° /14° 0 mm 10
Aug. 27 Partly cloudy
Partly cloudy
 24° /14° 0 mm 9
Aug. 28 Partly cloudy
Partly cloudy
 25° /15° 0 mm 9
Aug. 29 Cloudy
Cloudy
 25° /15° 0 mm 9
Aug. 30 Cloudy
Cloudy
 26° /13° 0 mm 9
Aug. 31 Overcast
Overcast
 24° /15° 0 mm 6
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Important Notice
Our weather forecast for Fairfax County in August 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.
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Fairfax County in August - FAQ

What are the expected maximum and minimum temperatures in Fairfax County during August?

During August, expect a variety of temperatures with highs around 28° and lows near 19°, suitable for diverse activities and preferences.

How much rainfall should be expected in Fairfax County during August?

Moderate rainfall is anticipated in Fairfax County during August, with a total of 81.9 mm spread over approximately 6 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Fairfax County during August?

The average wind speed in Fairfax County during August is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

August rainfall patterns in Fairfax County

Explore the daily rainfall trends and prepare for Fairfax Countys August weather 💧
Typically, Fairfax County has 6 rainy days in August with a total of 81.9 mm of rainfall.

UV exposure in Fairfax County during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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Location coordinates Where is Fairfax County?

Get accurate weather forecasts for Fairfax County, located at latitude 38.97 and longitude -77.386. Stay updated with localized weather information tailored for Fairfax County.

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