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Fairfax County (Herndon)
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United States weather

10 day weather forecast for Fairfax County

Saturday, August 1st, 2026, at 06:53 PM
today
Small Craft Advisory
Sunny
35° 19°
tomorrow
Partly cloudy
27° 22°
Monday
Partly cloudy
31° 22°
Tuesday
Fog
26° 22°
Wednesday
Fog
33° 21°
Thursday
Sunny
34° 23°
Friday
Sunny
36° 23°
 More Details See
more
Fairfax County Weather Pages

Fairfax County weather forecast

The weather forecast for Fairfax County for today indicates hot conditions with temperatures around 35 °F.

Rain is expected from Sunday until Tuesday.

Wind speeds are expected to be breezy, averaging around 17 km/h.

On Sunday, expect a change in weather with temperatures reaching 27°C, and moderate rain with a 78% chance, accumulating about 4.55mm.

Weather today
Fairfax County weather forecast

Fairfax County 14 days weather forecast

This weeks weather in Fairfax County. Click on a date for detailed forecasts
Sat. 1
35°
19°
Weather Alert
Sunny
0 mm
Sun. 2
27°
22°
Partly cloudy
4.6 mm
Mon. 3
31°
22°
Partly cloudy
7.4 mm
Tue. 4
26°
22°
Fog
4.8 mm
Wed. 5
33°
21°
Fog
0.1 mm
Thu. 6
34°
23°
Sunny
0 mm
Fri. 7
36°
23°
Sunny
0.1 mm
Sat. 8
35°
21°
Patchy rain possible
3.8 mm
Sun. 9
35°
21°
Patchy rain possible
5.6 mm
Mon. 10
35°
22°
Sunny
27.8 mm
Tue. 11
34°
22°
Sunny
6.9 mm
Wed. 12
32°
21°
Sunny
4.5 mm
Thu. 13
31°
20°
Partly cloudy
1.9 mm
Fri. 14
33°
22°
Partly cloudy
4 mm
Further Ahead
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Access Fairfax County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
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Fairfax County long range weather forecast

30 day weather forecast for Fairfax County
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Weather Alert Sunny
35°
2
Partly cloudy
27°
3
Partly cloudy
31°
4
Fog
26°
5
Fog
33°
6
Sunny
34°
7
Sunny
36°
8
Patchy rain possible
35°
9
Patchy rain possible
35°
10
Sunny
35°
11
Sunny
34°
12
Sunny
32°
13
Partly cloudy
31°
14
Partly cloudy
33°
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°
Important Notice
Our Fairfax County long range weather forecast is based on historical data analysis rather than real-time forecasting models. While this provides a general outlook, weather conditions can change. We recommend checking the forecast closer to your planned date for the most current information.

Rain Forecast for the Next 14 Days in Fairfax County

The chart displays the expected rainfall values (in mm) over the next 14 days in Fairfax County, highlighting variations in precipitation levels for specific dates. ☔

Fairfax County Wind Speed Forecast Chart

This chart illustrates the projected daily max wind speed (in km) in Fairfax County over the next two weeks, providing insights into periods of increased or decreased wind activity. 🌀

Frequently asked questions about the weather in Fairfax County

How warm is it in Fairfax County over the next 14 days?
Over the next two weeks, temperatures in Fairfax County are expected to range from around 19 °F on the coldest nights up to about 36 °F on the warmest days. Use this range to plan what to pack and wear.

Will it rain in Fairfax County in the next two weeks?
Yes - rain is expected on about 12 of the next 14 days in Fairfax County, with roughly 71.4 mm of rainfall in total. It is worth keeping an umbrella or raincoat handy.

How windy is it in Fairfax County?
Maximum wind speeds in Fairfax County are forecast to reach about 20 km/h at their peak over the next 14 days.

When is the best time to visit Fairfax County?
For a month-by-month look at temperatures and rainfall, see our best time to visit Fairfax County guide.

How accurate is the 14-day forecast for Fairfax County?
Our Fairfax County forecast uses leading meteorological models and is most reliable over the next few days. Long-range days beyond a week show general trends and can change, so check back closer to the date for updates.

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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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