Prince William County, Virginia, United States

Last updated: 10:36 PM CDT · Refresh

22°C

Feels like 23°

Overcast

▲ 31° / ▼ 20°

Wind

8 mph SSW

Humidity

94%

Dew Point

21°

Pressure

29.48 inHg

Visibility

3 mi

UV Index

0.0

Cloud Cover

95%

Sunrise

6:02 AM

Sunset

8:30 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Prince William County is currently overcast at 22°C. Precipitation is likely — peak probability 81% around 11 PM. Atmospheric instability is elevated (CAPE up to 993 J/kg) — isolated convective development possible. Sunrise: 6:02AM · Sunset: 8:30PM.

34 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

22°

81%

12 AM

22°

59%

1 AM

22°

58%

2 AM

22°

57%

3 AM

22°

28%

4 AM

22°

30%

5 AM

20°

40%

6 AM

21°

40%

7 AM

22°

41%

8 AM

23°

42%

9 AM

24°

38%

10 AM

26°

38%

11 AM

27°

26%

12 PM

28°

26%

1 PM

30°

26%

2 PM

30°

23%

3 PM

29°

24%

4 PM

28°

24%

5 PM

29°

24%

6 PM

27°

21%

7 PM

27°

21%

8 PM

26°

11%

9 PM

25°

12%

10 PM

24°

12%

7-Day Forecast

Tonight

31° 20°

Overcast with a 81% chance of rain.

Wed

31° 20°

Partly Cloudy with a 57% chance of rain.

Thu

28° 17°

Clear.

Fri

29° 15°

Mostly Cloudy with a 37% chance of rain.

Sat

27° 18°

Partly Cloudy with a 26% chance of rain.

Sun

32° 18°

Rain, 82% chance.

Mon

34° 19°

Rain, 64% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 22° Overcast 81% 8 mph SSW 94%

12 AM 22° Rain 59% 10 mph SSW 94%

1 AM 22° Rain 58% 9 mph SSW 94%

2 AM 22° Mostly Cloudy 57% 9 mph SSW 94%

3 AM 22° Partly Cloudy 28% 7 mph SSW 95%

4 AM 22° Partly Cloudy 30% 6 mph SSW 96%

5 AM 20° Partly Cloudy 40% 5 mph SSW 96%

6 AM 21° Partly Cloudy 40% 5 mph SW 95%

7 AM 22° Partly Cloudy 41% 5 mph WSW 93%

8 AM 23° Partly Cloudy 42% 6 mph WSW 86%

9 AM 24° Mostly Cloudy 38% 6 mph W 78%

10 AM 26° Mostly Cloudy 38% 6 mph W 69%

11 AM 27° Partly Cloudy 26% 7 mph W 62%

12 PM 28° Partly Cloudy 26% 8 mph W 56%

1 PM 30° Partly Cloudy 26% 9 mph W 50%

2 PM 30° Partly Cloudy 23% 8 mph W 48%

3 PM 29° Partly Cloudy 24% 7 mph WNW 51%

4 PM 28° Partly Cloudy 24% 7 mph WNW 54%

5 PM 29° Partly Cloudy 24% 6 mph NW 56%

6 PM 27° Partly Cloudy 21% 6 mph NW 58%

7 PM 27° Partly Cloudy 21% 6 mph NNW 60%

8 PM 26° Partly Cloudy 11% 7 mph NNW 59%

9 PM 25° Partly Cloudy 12% 7 mph NNW 57%

10 PM 24° Partly Cloudy 12% 8 mph NNW 55%

15-Day Forecast

Today

7/21

Overcast

81%

20°

31°

Wed

7/22

Partly Cloudy

57%

20°

31°

Thu

7/23

Clear

17°

28°

Fri

7/24

Mostly Cloudy

37%

15°

29°

Sat

7/25

Partly Cloudy

26%

18°

27°

Sun

7/26

Rain

82%

18°

32°

Mon

7/27

Rain

64%

19°

34°

Tue

7/28

Rain

63%

19°

37°

Wed

7/29

Rain

69%

18°

32°

Thu

7/30

Drizzle

44%

17°

31°

Fri

7/31

Drizzle

60%

17°

31°

Sat

8/1

Drizzle

60%

18°

31°

Sun

8/2

Drizzle

60%

18°

31°

Mon

8/3

Drizzle

60%

19°

33°

Tue

8/4

Drizzle

60%

19°

33°

Good

U.S. Air Quality Index · Dominant: O3

50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today

PM_2.5

Fine particulate matter

25 AQI 4.5 µg/m³

O₃

Ground-level ozone

Dominant

34 AQI 38 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Today 34 Good 34 25

Thu 36 Good 36 15

Fri 39 Good 39 23

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 Wed Jul 22, 02:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE50 J/kg

MLCAPE131 J/kg

MUCAPE215 J/kg

SBCIN-276 J/kg

MLCIN0 J/kg

Lifted Index-0.4

Kinematics

0–6 km Shear38 kt

0–1 km Shear26 kt

Eff. Shear17 kt

0–1 km SRH6

0–3 km SRH-11

Eff. SRH-25

Storm Motion241° @ 36 kt

0–1 km EHI0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index32.7

Thermo & Levels

PWAT1.89 in

0–3 km LR4.2 °C/km

700–500 LR5.9 °C/km

Total Totals46.9

LCL985 hPa

LFC654 hPa

EL452 hPa

Freezing Lvl14,442 ft

Prince William County, Virginia, United States

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