Fairfax, Virginia

Last updated: 9:21 PM CDT  ·  Refresh
24°C
Feels like 27°
Rain
▲ 38°  /  ▼ 21°
Wind
5 mph WNW
Humidity
84%
Dew Point
21°
Pressure
29.59 inHg
Visibility
6 mi
UV Index
0.0
Cloud Cover
72%
Sunrise
5:49 AM
Sunset
8:37 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Fairfax is currently rain at 24°C. Precipitation is likely — peak probability 86% around 10 PM. Atmospheric instability is elevated (CAPE up to 1412 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:37PM.

Alerts

No active alerts for this location.
60 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
70%
11 PM
24°
49%
12 AM
24°
49%
1 AM
24°
30%
2 AM
24°
15%
3 AM
24°
15%
4 AM
23°
16%
5 AM
21°
13%
6 AM
21°
8%
7 AM
22°
5%
8 AM
23°
18%
9 AM
25°
18%
10 AM
27°
22%
11 AM
28°
30%
12 PM
30°
30%
1 PM
33°
33%
2 PM
34°
45%
3 PM
34°
56%
4 PM
34°
56%
5 PM
34°
75%
6 PM
32°
80%
7 PM
29°
80%
8 PM
28°
80%
9 PM
27°
81%
7-Day Forecast
Tonight
38° 21°
Rain, 70% chance.
Sun
36° 21°
Partly Cloudy with a 86% chance of rain.
Mon
32° 21°
Mostly Cloudy with a 90% chance of rain.
Tue
31° 21°
Rain, 74% chance.
Wed
29° 19°
Clear with a 31% chance of rain.
Thu
34° 21°
Rain, 70% chance.
Fri
37° 22°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 24° Rain 70% 5 mph WNW 84%
11 PM 24° Overcast 49% 2 mph NNE 87%
12 AM 24° Overcast 49% 2 mph NNW 84%
1 AM 24° Overcast 30% 4 mph WNW 82%
2 AM 24° Overcast 15% 4 mph WNW 82%
3 AM 24° Mostly Cloudy 15% 3 mph WSW 84%
4 AM 23° Mostly Cloudy 16% 4 mph SSW 87%
5 AM 21° Mostly Cloudy 13% 4 mph SSW 88%
6 AM 21° Mostly Cloudy 8% 3 mph SSW 87%
7 AM 22° Mostly Cloudy 5% 2 mph SSE 84%
8 AM 23° Partly Cloudy 18% 2 mph E 79%
9 AM 25° Partly Cloudy 18% 2 mph ESE 71%
10 AM 27° Mostly Clear 22% 2 mph SE 63%
11 AM 28° Mostly Clear 30% 2 mph SSE 57%
12 PM 30° Mostly Clear 30% 3 mph S 52%
1 PM 33° Clear 33% 4 mph S 48%
2 PM 34° Clear 45% 5 mph S 45%
3 PM 34° Mostly Clear 56% 5 mph S 44%
4 PM 34° Mostly Clear 56% 6 mph SSE 44%
5 PM 34° Partly Cloudy 75% 6 mph SSE 47%
6 PM 32° Partly Cloudy 80% 7 mph SSE 57%
7 PM 29° Mostly Cloudy 80% 8 mph SSE 68%
8 PM 28° Mostly Cloudy 80% 8 mph SE 76%
9 PM 27° Rain 81% 6 mph SSE 79%
15-Day Forecast
Today
7/4
Rain
70%
21°
38°
Sun
7/5
Partly Cloudy
86%
21°
36°
Mon
7/6
Mostly Cloudy
90%
21°
32°
Tue
7/7
Rain
74%
21°
31°
Wed
7/8
Clear
31%
19°
29°
Thu
7/9
Rain
70%
21°
34°
Fri
7/10
Rain
63%
22°
37°
Sat
7/11
Rain
63%
21°
32°
Sun
7/12
Rain
68%
19°
31°
Mon
7/13
Drizzle
44%
18°
32°
Tue
7/14
Drizzle
60%
21°
34°
Wed
7/15
Drizzle
60%
21°
34°
Thu
7/16
Drizzle
60%
21°
34°
Fri
7/17
Drizzle
60%
20°
34°
Sat
7/18
Drizzle
60%
21°
34°
60
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
60 AQI 14.1 µg/m³
O3
Ground-level ozone
51 AQI 55 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 60 Moderate 51 60
Mon 55 Moderate 44 55
Tue 51 Moderate 44 51
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Jul 5, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE426 J/kg
MLCAPE346 J/kg
MUCAPE486 J/kg
SBCIN-428 J/kg
MLCIN0 J/kg
Lifted Index-2.5
Kinematics
0–6 km Shear18 kt
0–1 km Shear23 kt
Eff. Shear3 kt
0–1 km SRH-115
0–3 km SRH-108
Eff. SRH-1
Storm Motion195° @ 25 kt
0–1 km EHI-0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.9
Thermo & Levels
PWAT1.90 in
0–3 km LR5.1 °C/km
700–500 LR5.8 °C/km
Total Totals48.2
LCL963 hPa
LFC722 hPa
EL336 hPa
Freezing Lvl14,065 ft