Fairfax County, VA Weather Forecast
County weather hub
Sunny
Compare major city weather across Fairfax County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 96. Southwest wind 2 to 12 mph, with gusts as high as 20 mph.
County Weather Overview
This county weather page brings together forecast coverage for Fairfax County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 9 of 9 mapped cities in Fairfax County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 18 to May 24, 2026
- Latest sync
- May 17, 2026 8:26 PM EDT
- Forecast office
- LWX
- Source
- NOAA / NWS
Daily Outlook
This Week in Fairfax County
Monday looks like the warmest upcoming period in Fairfax County at 96 degrees F.
Thursday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Tuesday at about 6 to 13 mph SW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- May 17, 2026 8:26 PM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- LWX
- Radar station
- KLWX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 71. South wind 7 to 12 mph, with gusts as high as 20 mph.
Sunny, with a high near 96. Southwest wind 6 to 13 mph, with gusts as high as 21 mph.
Mostly clear, with a low around 73. Southwest wind 7 to 13 mph, with gusts as high as 20 mph.
Showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 80%.
A chance of rain showers before 8am, then a chance of showers and thunderstorms. Partly sunny, with a high near 70. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 68. Chance of precipitation is 50%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Rain showers likely before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 73. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
A chance of rain showers before 2pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 78.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
May 18
|
Sunny
|
96°F |
2 to 12 mph
SW
|
|
Monday Night
May 18
|
Mostly Clear
|
71°F |
7 to 12 mph
S
|
|
Tuesday
May 19
|
Sunny
|
96°F |
6 to 13 mph
SW
|
|
Tuesday Night
May 19
|
Mostly Clear
|
73°F |
7 to 13 mph
SW
|
|
Wednesday
May 20
|
Mostly Sunny then Showers And Thunderstorms
|
94°F |
5 to 10 mph
W
|
|
Wednesday Night
May 20
|
Showers And Thunderstorms
|
59°F |
10 mph
NW
|
|
Thursday
May 21
|
Chance Showers And Thunderstorms
|
70°F |
6 to 10 mph
NE
|
|
Thursday Night
May 21
|
Chance Showers And Thunderstorms
|
54°F |
1 to 5 mph
E
|
|
Friday
May 22
|
Chance Rain Showers
|
68°F |
5 to 9 mph
E
|
|
Friday Night
May 22
|
Showers And Thunderstorms Likely
|
56°F |
3 to 9 mph
E
|
|
Saturday
May 23
|
Rain Showers Likely
|
73°F |
3 to 7 mph
SE
|
|
Saturday Night
May 23
|
Showers And Thunderstorms Likely
|
60°F |
6 mph
SE
|
|
Sunday
May 24
|
Showers And Thunderstorms Likely
|
78°F |
3 to 7 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across Fairfax County.
Coverage
Forecast coverage currently spans 9 of 9 mapped cities in Fairfax County.
Largest mapped city population in this region: 48,115.
