One Loudoun, Virginia

Last updated: 9:22 PM CDT · Refresh

24°C

Feels like 27°

Mostly Cloudy

▲ 37° / ▼ 20°

Wind

5 mph WSW

Humidity

83%

Dew Point

21°

Pressure

29.66 inHg

Visibility

9 mi

UV Index

0.0

Cloud Cover

79%

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 24°C. Precipitation is likely — peak probability 80% around 7 PM. Atmospheric instability is elevated (CAPE up to 1167 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

24°

65%

11 PM

24°

52%

12 AM

24°

33%

1 AM

23°

41%

2 AM

23°

15%

3 AM

23°

15%

4 AM

22°

16%

5 AM

20°

16%

6 AM

21°

13%

7 AM

21°

8 AM

23°

21%

9 AM

26°

21%

10 AM

27°

29%

11 AM

29°

30%

12 PM

31°

33%

1 PM

34°

34%

2 PM

35°

44%

3 PM

35°

53%

4 PM

35°

56%

5 PM

34°

79%

6 PM

32°

80%

7 PM

30°

80%

8 PM

29°

70%

9 PM

27°

71%

7-Day Forecast

Tonight

37° 20°

Mostly Cloudy with a 65% chance of rain.

Sun

35° 20°

Partly Cloudy with a 79% chance of rain.

Mon

31° 21°

Rain, 85% chance.

Tue

30° 21°

Rain, 74% chance.

Wed

29° 18°

Clear with a 31% chance of rain.

Thu

33° 20°

Drizzle, 51% chance.

Fri

37° 21°

Rain, 71% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 24° Mostly Cloudy 65% 5 mph WSW 83%

11 PM 24° Overcast 52% 4 mph NW 87%

12 AM 24° Mostly Cloudy 33% 4 mph NW 86%

1 AM 23° Mostly Cloudy 41% 3 mph W 85%

2 AM 23° Mostly Cloudy 15% 4 mph WSW 86%

3 AM 23° Mostly Cloudy 15% 2 mph WSW 88%

4 AM 22° Partly Cloudy 16% 2 mph W 90%

5 AM 20° Mostly Cloudy 16% 3 mph W 91%

6 AM 21° Mostly Cloudy 13% 3 mph WSW 90%

7 AM 21° Mostly Cloudy 5% 2 mph SE 88%

8 AM 23° Mostly Cloudy 21% 2 mph ESE 82%

9 AM 26° Partly Cloudy 21% 2 mph SE 75%

10 AM 27° Partly Cloudy 29% 2 mph SE 67%

11 AM 29° Partly Cloudy 30% 3 mph SSE 60%

12 PM 31° Mostly Clear 33% 4 mph S 54%

1 PM 34° Mostly Clear 34% 4 mph S 49%

2 PM 35° Mostly Clear 44% 5 mph S 46%

3 PM 35° Mostly Clear 53% 5 mph S 45%

4 PM 35° Partly Cloudy 56% 5 mph SSE 45%

5 PM 34° Partly Cloudy 79% 5 mph SSE 50%

6 PM 32° Partly Cloudy 80% 6 mph SSE 59%

7 PM 30° Mostly Cloudy 80% 7 mph SSE 68%

8 PM 29° Rain 70% 6 mph SSE 76%

9 PM 27° Rain 71% 5 mph W 80%

15-Day Forecast

Today

7/4

Mostly Cloudy

65%

20°

37°

Sun

7/5

Partly Cloudy

79%

20°

35°

Mon

7/6

Rain

85%

21°

31°

Tue

7/7

Rain

74%

21°

30°

Wed

7/8

Clear

31%

18°

29°

Thu

7/9

Drizzle

51%

20°

33°

Fri

7/10

Rain

71%

21°

37°

Sat

7/11

Rain

63%

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 Sun Jul 5, 01:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE267 J/kg

MLCAPE247 J/kg

MUCAPE442 J/kg

SBCIN-452 J/kg

MLCIN0 J/kg

Lifted Index-2.0

Kinematics

0–6 km Shear17 kt

0–1 km Shear22 kt

Eff. Shear6 kt

0–1 km SRH-88

0–3 km SRH-77

Eff. SRH0

Storm Motion195° @ 24 kt

0–1 km EHI-0.2

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index37.2

Thermo & Levels

PWAT1.92 in

0–3 km LR5.1 °C/km

700–500 LR5.8 °C/km

Total Totals47.6

LCL955 hPa

LFC711 hPa

EL388 hPa

Freezing Lvl14,016 ft

One Loudoun, Virginia

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