Fairfax, Virginia

Last updated: 8:20 PM CDT · Refresh

26°C

Feels like 28°

Rain

▲ 38° / ▼ 21°

Wind

7 mph WSW

Humidity

75%

Dew Point

21°

Pressure

29.57 inHg

Visibility

10 mi

UV Index

0.0

Cloud Cover

78%

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 26°C. Precipitation is likely — peak probability 90% around 9 PM. Atmospheric instability is elevated (CAPE up to 1721 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:37PM.

60 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

26°

70%

10 PM

25°

72%

11 PM

24°

51%

12 AM

24°

50%

1 AM

24°

31%

2 AM

24°

15%

3 AM

24°

16%

4 AM

23°

16%

5 AM

21°

13%

6 AM

21°

7 AM

22°

8 AM

24°

18%

9 AM

26°

18%

10 AM

27°

22%

11 AM

29°

30%

12 PM

31°

33%

1 PM

33°

38%

2 PM

34°

49%

3 PM

34°

56%

4 PM

34°

56%

5 PM

33°

75%

6 PM

32°

80%

7 PM

29°

80%

8 PM

28°

81%

7-Day Forecast

Tonight

38° 21°

Rain, 70% chance.

Sun

36° 21°

Mostly Clear with a 90% chance of rain.

Mon

32° 21°

Overcast with a 90% chance of rain.

Tue

31° 21°

Rain, 68% chance.

Wed

29° 19°

Clear with a 37% chance of rain.

Thu

34° 21°

Drizzle, 70% chance.

Fri

38° 22°

Rain, 82% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 26° Rain 70% 7 mph WSW 75%

10 PM 25° Rain 72% 6 mph SW 80%

11 PM 24° Heavy Rain 51% 4 mph NNW 82%

12 AM 24° Overcast 50% 2 mph NNW 82%

1 AM 24° Overcast 31% 4 mph NW 81%

2 AM 24° Overcast 15% 4 mph WNW 81%

3 AM 24° Mostly Cloudy 16% 3 mph W 83%

4 AM 23° Partly Cloudy 16% 4 mph SW 86%

5 AM 21° Partly Cloudy 13% 4 mph SSW 87%

6 AM 21° Partly Cloudy 8% 2 mph SSW 84%

7 AM 22° Mostly Clear 5% 2 mph ENE 82%

8 AM 24° Mostly Clear 18% 3 mph E 77%

9 AM 26° Mostly Clear 18% 3 mph ESE 70%

10 AM 27° Mostly Clear 22% 3 mph ESE 63%

11 AM 29° Mostly Clear 30% 3 mph SE 56%

12 PM 31° Mostly Clear 33% 4 mph SSE 51%

1 PM 33° Mostly Clear 38% 4 mph SSE 47%

2 PM 34° Mostly Clear 49% 5 mph SSE 45%

3 PM 34° Mostly Clear 56% 4 mph SSE 47%

4 PM 34° Mostly Clear 56% 5 mph SSE 48%

5 PM 33° Partly Cloudy 75% 5 mph SE 51%

6 PM 32° Partly Cloudy 80% 6 mph SE 61%

7 PM 29° Mostly Cloudy 80% 7 mph SE 71%

8 PM 28° Mostly Cloudy 81% 7 mph SE 78%

15-Day Forecast

Today

7/4

Rain

70%

21°

38°

Sun

7/5

Mostly Clear

90%

21°

36°

Mon

7/6

Overcast

90%

21°

32°

Tue

7/7

Rain

68%

21°

31°

Wed

7/8

Clear

37%

19°

29°

Thu

7/9

Drizzle

70%

21°

34°

Fri

7/10

Rain

82%

22°

38°

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°

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

PM_2.5

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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Sat Jul 4, 23:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE526 J/kg

MLCAPE818 J/kg

MUCAPE969 J/kg

SBCIN-319 J/kg

MLCIN0 J/kg

Lifted Index-3.2

Kinematics

0–6 km Shear13 kt

0–1 km Shear15 kt

Eff. Shear4 kt

0–1 km SRH-64

0–3 km SRH-69

Eff. SRH-6

Storm Motion199° @ 27 kt

0–1 km EHI-0.2

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index37.1

Thermo & Levels

PWAT2.05 in

0–3 km LR5.5 °C/km

700–500 LR6.1 °C/km

Total Totals50.0

LCL936 hPa

LFC718 hPa

EL270 hPa

Freezing Lvl14,236 ft

Fairfax, Virginia

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