One Loudoun, Virginia

Last updated: 8:21 PM CDT · Refresh

26°C

Feels like 28°

Mostly Cloudy

▲ 37° / ▼ 21°

Wind

5 mph SW

Humidity

75%

Dew Point

21°

Pressure

29.64 inHg

Visibility

9 mi

UV Index

0.0

Cloud Cover

73%

Sunrise

5:49 AM

Sunset

8:39 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: One Loudoun is currently mostly cloudy at 26°C. Precipitation is likely — peak probability 80% around 5 PM. Atmospheric instability is elevated (CAPE up to 1372 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:39PM.

60 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

26°

65%

10 PM

25°

71%

11 PM

24°

31%

12 AM

24°

30%

1 AM

24°

28%

2 AM

23°

15%

3 AM

23°

16%

4 AM

23°

16%

5 AM

21°

16%

6 AM

21°

13%

7 AM

22°

8 AM

23°

21%

9 AM

26°

22%

10 AM

27°

30%

11 AM

29°

30%

12 PM

31°

40%

1 PM

34°

41%

2 PM

34°

52%

3 PM

34°

52%

4 PM

36°

56%

5 PM

34°

80%

6 PM

32°

76%

7 PM

31°

77%

8 PM

29°

71%

7-Day Forecast

Tonight

37° 21°

Mostly Cloudy with a 65% chance of rain.

Sun

36° 21°

Partly Cloudy with a 79% chance of rain.

Mon

31° 21°

Overcast with a 90% chance of rain.

Tue

30° 21°

Rain, 74% chance.

Wed

29° 18°

Clear with a 37% chance of rain.

Thu

33° 20°

Drizzle, 51% chance.

Fri

37° 21°

Rain, 71% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 26° Mostly Cloudy 65% 5 mph SW 75%

10 PM 25° Mostly Cloudy 71% 7 mph SW 83%

11 PM 24° Mostly Cloudy 31% 5 mph NW 86%

12 AM 24° Mostly Cloudy 30% 3 mph NNW 85%

1 AM 24° Mostly Cloudy 28% 3 mph W 85%

2 AM 23° Mostly Cloudy 15% 4 mph W 85%

3 AM 23° Partly Cloudy 16% 2 mph WSW 87%

4 AM 23° Partly Cloudy 16% 3 mph W 89%

5 AM 21° Partly Cloudy 16% 4 mph W 90%

6 AM 21° Partly Cloudy 13% 2 mph WSW 88%

7 AM 22° Partly Cloudy 5% 2 mph SE 86%

8 AM 23° Mostly Cloudy 21% 3 mph SE 81%

9 AM 26° Mostly Cloudy 22% 3 mph ESE 74%

10 AM 27° Partly Cloudy 30% 3 mph ESE 67%

11 AM 29° Mostly Clear 30% 4 mph ESE 61%

12 PM 31° Mostly Clear 40% 4 mph SE 55%

1 PM 34° Mostly Clear 41% 4 mph SSE 50%

2 PM 34° Mostly Clear 52% 4 mph SSE 48%

3 PM 34° Partly Cloudy 52% 4 mph SSE 48%

4 PM 36° Partly Cloudy 56% 4 mph SSE 48%

5 PM 34° Partly Cloudy 80% 5 mph SSE 51%

6 PM 32° Partly Cloudy 76% 6 mph SSE 60%

7 PM 31° Partly Cloudy 77% 7 mph SE 68%

8 PM 29° Mostly Cloudy 71% 6 mph SE 76%

15-Day Forecast

Today

7/4

Mostly Cloudy

65%

21°

37°

Sun

7/5

Partly Cloudy

79%

21°

36°

Mon

7/6

Overcast

90%

21°

31°

Tue

7/7

Rain

74%

21°

30°

Wed

7/8

Clear

37%

18°

29°

Thu

7/9

Drizzle

51%

20°

33°

Fri

7/10

Rain

71%

21°

37°

Sat

7/11

Drizzle

53%

19°

31°

Sun

7/12

Drizzle

44%

18°

31°

Mon

7/13

Drizzle

44%

17°

32°

Tue

7/14

Drizzle

60%

19°

34°

Wed

7/15

Drizzle

60%

19°

34°

Thu

7/16

Drizzle

60%

19°

34°

Fri

7/17

Drizzle

60%

19°

33°

Sat

7/18

Drizzle

60%

20°

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 13.9 µg/m³

O₃

Ground-level ozone

50 AQI 54 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Today 60 Moderate 50 60

Mon 54 Moderate 44 54

Tue 46 Good 42 46

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

SBCAPE479 J/kg

MLCAPE703 J/kg

MUCAPE796 J/kg

SBCIN-323 J/kg

MLCIN0 J/kg

Lifted Index-3.2

Kinematics

0–6 km Shear15 kt

0–1 km Shear17 kt

Eff. Shear9 kt

0–1 km SRH-47

0–3 km SRH-57

Eff. SRH-13

Storm Motion205° @ 27 kt

0–1 km EHI-0.1

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index36.9

Thermo & Levels

PWAT2.04 in

0–3 km LR5.4 °C/km

700–500 LR6.2 °C/km

Total Totals50.7

LCL934 hPa

LFC712 hPa

EL295 hPa

Freezing Lvl14,304 ft

One Loudoun, Virginia

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