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Fairfax County (Herndon)
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United States weather

10 day weather forecast for Fairfax County

Sunday, November 1st, 2026, at 12:29 PM
Today
Overcast
17° 9°
Tomorrow
Overcast
18° 9°
Tuesday
Sunny
21° 8°
Wednesday
Sunny
22° 11°
Thursday
Moderate rain
21° 14°
Friday
Moderate rain
19° 14°
Saturday
Partly cloudy
18° 11°
 More Details See
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Fairfax County Weather Pages

Fairfax County weather forecast

The weather forecast for Fairfax County over the next 5 days indicates chilly conditions with temperatures ranging from 17 °C to 22 °C.

Heavy rain is expected on Thursday, accompanied by a gentle breeze.

Weather today

Fairfax County 14 days weather forecast

This weeks weather in Fairfax County. Click on a date for detailed forecasts
Sun. 1
17°
9°
Overcast
0 mm
Mon. 2
18°
9°
Overcast
0 mm
Tue. 3
21°
8°
Sunny
0 mm
Wed. 4
22°
11°
Sunny
0 mm
Thu. 5
21°
14°
Moderate rain
17 mm
Fri. 6
19°
14°
Moderate rain
13.2 mm
Sat. 7
18°
11°
Partly cloudy
0 mm
Sun. 8
16°
8°
Partly cloudy
0.1 mm
Mon. 9
15°
8°
Partly cloudy
0 mm
Tue. 10
15°
8°
Patchy rain possible
1.5 mm
Wed. 11
17°
9°
Light rain
6.4 mm
Thu. 12
10°
8°
Patchy rain possible
1.1 mm
Fri. 13
12°
6°
Patchy light drizzle
1.9 mm
Sat. 14
9°
4°
Partly cloudy
0.6 mm
Further Ahead
Select a date

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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
October
December
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
17°
2
Overcast
18°
3
Sunny
21°
4
Sunny
22°
5
Moderate rain
21°
6
Moderate rain
19°
7
Partly cloudy
18°
8
Partly cloudy
16°
9
Partly cloudy
15°
10
Patchy rain possible
15°
11
Light rain
17°
12
Patchy rain possible
10°
13
Patchy light drizzle
12°
14
Partly cloudy
9°
15
Thundery outbreaks possible
12°
16
Overcast
15°
17
Sunny
8°
18
Moderate rain at times
4°
19
Heavy rain
7°
20
Mist
7°
21
Light rain
11°
22
Heavy rain
9°
23
Mist
12°
24
Sunny
12°
25
Moderate rain
10°
26
Light rain
19°
27
Overcast
6°
28
Sunny
6°
29
Partly cloudy
6°
30
Heavy rain at times
3°
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

A total of 41.8 mm is expected over 6 rainy days. The wettest day is Thursday 5, with 17 mm. Click a day for details.
Sun. 1
0 mm
12%
Mon. 2
0 mm
13%
Tue. 3
0 mm
8%
Wed. 4
0 mm
10%
Thu. 5
17
17 mm
93%
Fri. 6
13.2
13.2 mm
89%
Sat. 7
0 mm
10%
Sun. 8
0.1
0.1 mm
18%
Mon. 9
0 mm
15%
Tue. 10
1.5
1.5 mm
61%
Wed. 11
6.4
6.4 mm
81%
Thu. 12
1.1
1.1 mm
66%
Fri. 13
1.9
1.9 mm
63%
Sat. 14
0.6
0.6 mm
48%

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 4 °C on the coldest nights up to about 22 °C 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 6 of the next 14 days in Fairfax County, with roughly 41.8 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 17.6 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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