Observed 6:50 PM EDT at KIAD

Bull Run, VA weather

Mostly clear and 54°12°.

Mostly agree

Now 54°12°

Mostly clear

Wind: 5 mph7 km/h; From the southeast. Light through 7 AM
Dew point: 43°6°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 33Good; Ozone · tomorrow moderate
Pressure: 30.51 inHg1033 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

3°2° cooler than this time yesterday (55°13° then, 52°11° now)

Good hours for

Below 50°10° tonight after 9 PM
Low 38°3° tomorrow at 6 AM
Above 50°10° tomorrow by 11 AM
High 65°18° tomorrow at 5 PM
Fog Monday 8–9 AM

TonightDown to 39°4° by 4 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 5 PM · Clear
Tomorrow nightDown to 39°4° by 5 AM · Clear
Monday morningUp to 57°14° by 11 AM · Partly cloudy
Monday afternoonUp to 70°21° by 3 PM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 7p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	3 mph5 km/h from E, gusts 5 mph8 km/h	55%	21%	0
Sat 8p	Mostly clear	51°11° (likely 51°11° to 53°12°)	51°11°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	68%	19%	0
Sat 9p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	2 mph3 km/h from E, gusts 8 mph13 km/h	80%	8%	0
Sat 10p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	86%	8%	0
Sat 11p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	89%	15%	0
Sun 12a	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	93%	17%	0
Sun 1a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	93%	16%	0
Sun 2a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	93%	13%	0
Sun 3a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	96%	8%	0
Sun 4a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	96%	4%	0
Sun 5a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	1 mph2 km/h from E, gusts 5 mph7 km/h	96%	9%	0
Sun 6a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	96%	13%	0
Sun 7a	Sunny	38°3° (likely 38°3° to 40°4°)	38°3°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	96%	6%	0
Sun 8a	Mostly sunny	38°3° (likely 38°3° to 41°5°)	38°3°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	100%	15%	0
Sun 9a	Sunny	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from N, gusts 5 mph7 km/h	93%	11%	1
Sun 10a	Mostly sunny	49°9° (likely 49°9° to 53°12°)	49°9°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	83%	12%	2
Sun 11a	Sunny	55°13° (likely 55°13° to 58°14°)	55°13°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	69%	4%	3
Sun 12p	Sunny	58°14° (likely 58°14° to 62°17°)	58°14°	0%	1 mph2 km/h from E, gusts 5 mph7 km/h	62%	3%	4
Sun 1p	Sunny	61°16° (likely 61°16° to 64°18°)	61°16°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	53%	8%	4
Sun 2p	Mostly sunny	64°18° (likely 63°17° to 66°19°)	64°18°	0%	2 mph3 km/h from S, gusts 5 mph9 km/h	48%	14%	4
Sun 3p	Sunny	64°18° (likely 64°18° to 67°19°)	64°18°	0%	2 mph3 km/h from S, gusts 6 mph10 km/h	48%	13%	4
Sun 4p	Sunny	64°18° (likely 64°18° to 66°19°)	64°18°	0%	2 mph3 km/h from S, gusts 7 mph11 km/h	50%	9%	3
Sun 5p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	2 mph3 km/h from S, gusts 6 mph10 km/h	48%	8%	1
Sun 6p	Clear	62°17° (likely 59°15° to 62°17°)	62°17°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	54%	2%	0
Sun 7p	Clear	58°14° (likely 55°13° to 58°14°)	58°14°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	62%	0%	0
Sun 8p	Clear	54°12° (likely 52°11° to 55°13°)	54°12°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	71%	0%	0
Sun 9p	Clear	49°9° (likely 49°9° to 53°12°)	49°9°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	83%	0%	0
Sun 10p	Clear	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	89%	1%	0
Sun 11p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	93%	1%	0
Mon 12a	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	1 mph2 km/h from S, gusts 3 mph4 km/h	96%	2%	0
Mon 1a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	96%	1%	0
Mon 2a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	9%	0
Mon 3a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 3 mph4 km/h	96%	14%	0
Mon 4a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	16%	0
Mon 5a	Mostly clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	1 mph2 km/h from W, gusts 3 mph4 km/h	100%	23%	0
Mon 6a	Mostly clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	1 mph2 km/h from W, gusts 2 mph3 km/h	100%	29%	0
Mon 7a	Partly cloudy	38°3° (likely 38°3° to 42°6°)	38°3°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	50%	0
Mon 8a	Fog	38°3° (likely 37°3° to 42°6°)	38°3°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	96%	60%	0
Mon 9a	Mostly sunny	42°6° (likely 42°6° to 47°8°)	42°6°	0%	1 mph2 km/h from NW, gusts 3 mph4 km/h	96%	55%	1
Mon 10a	Mostly sunny	49°9° (likely 49°9° to 54°12°)	49°9°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	83%	19%	2
Mon 11a	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	67%	5%	3
Mon 12p	Sunny	61°16° (likely 61°16° to 64°18°)	61°16°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	58%	1%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 67°19°)	65°18°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	50%	0%	4
Mon 2p	Sunny	68°20° (likely 67°19° to 68°20°)	68°20°	0%	6 mph10 km/h from NW, gusts 10 mph16 km/h	45%	0%	4
Mon 3p	Sunny	70°21° (likely 68°20° to 70°21°)	70°21°	0%	6 mph10 km/h from NW, gusts 11 mph18 km/h	42%	0%	4
Mon 4p	Sunny	70°21° (likely 68°20° to 70°21°)	70°21°	0%	3 mph5 km/h from NW, gusts 10 mph17 km/h	42%	0%	3
Mon 5p	Sunny	70°21° (likely 67°19° to 70°21°)	70°21°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	44%	0%	2
Mon 6p	Clear	66°19° (likely 62°17° to 66°19°)	66°19°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	50%	0%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Mostly sunny. High 63°17°, low 36°2°. Typical 65°18° / 42°6°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Tonight: Mostly clear, with a low around 36. Southeast wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
35°2°–36°2°
Typical high / low
65°18° / 42°6°
Wind
6 mph9 km/h, gusts 12 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 65°18°, low 37°3°. Typical 64°18° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Day: Sunny, with a high near 65. East wind around 2 mph.
Night: Mostly clear, with a low around 37. South wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
37°3°–40°4°
Typical high / low
64°18° / 42°6°
Wind
5 mph8 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 71°22°, low 47°8°. Typical 64°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 71. Northwest wind 1 to 6 mph.
Night: Mostly clear, with a low around 47. Northwest wind 1 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–71°22°
Low, likely
37°3°–47°8°
Typical high / low
64°18° / 41°5°
Wind
6 mph10 km/h, gusts 14 mph22 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 69°21°, low 46°8°. Typical 64°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69.
Night: Mostly clear, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–69°21°
Low, likely
44°7°–50°10°
Typical high / low
64°18° / 41°5°
Wind
8 mph12 km/h, gusts 17 mph27 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 66°19°, low 47°8°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 66.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
43°6°–48°9°
Typical high / low
64°18° / 41°5°
Wind
6 mph10 km/h, gusts 13 mph21 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 71°22°, low 48°9°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–71°22°
Low, likely
45°7°–48°9°
Typical high / low
63°17° / 40°4°
Wind
7 mph11 km/h, gusts 23 mph37 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 75°24°, low 50°10°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 75.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
74°23°–75°24°
Low, likely
44°7°–50°10°
Typical high / low
63°17° / 40°4°
Wind
6 mph10 km/h, gusts 26 mph42 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 72°22°, low 49°9°. Typical 62°17° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 72.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–73°23°
Low, likely
44°7°–54°12°
Typical high / low
62°17° / 40°4°
Wind
7 mph11 km/h, gusts 27 mph44 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 68°20°, low 54°12°. Typical 62°17° / 40°4°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°14°
  20% chance
2. Afternoon
  noon–6 PM
  Drizzle, 67°19°
  30% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.04 in1 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°16°
  30% chance · 0.06 in1.4 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–72°22°
Low, likely
52°11°–57°14°
Typical high / low
62°17° / 40°4°
Wind
9 mph14 km/h, gusts 20 mph31 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 72°22°, low 57°14°. Typical 62°17° / 39°4°. Rain 0.48 in12 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  30% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  20% chance · 0.43 in11 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–78°26°
Low, likely
50°10°–66°19°
Typical high / low
62°17° / 39°4°
Wind
17 mph27 km/h, gusts 37 mph60 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 36°.
Tomorrow
Dry, high 65°, low 37°.
Monday
Dry, high 71°, low 47°, warming up.
Rest of week
Mostly dry, highs 66–75°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (LWX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Youngs Branch at Manassas Battlefield

2.5 mi

Below flood stage

Level: 0.6 ft

Reading from Sat 5:40 PM · NWS gauge page

Flat Branch at Ben Lomond Park

3.4 mi

Level: 0.7 ft

Reading from Sat 4:55 PM · NWS gauge page

Flat Branch near Unnamed Tributary At Amherst Drive

3.5 mi

Level: 0.6 ft

Reading from Sat 5:05 PM · NWS gauge page

Flatlick Branch at Chantilly

4.3 mi

Below flood stage

Level: 1.1 ft
Flow: 18 cfs

Reading from Sat 5 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 67% less heating than a typical week.

This week 29Typical 88

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 24
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Sun, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Washington Dulles International Airport · official normals 1991–2020 · records 1960–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−6°−3°SunOct 18
−3°−2°MonOct 19
+2°+1°TueOct 20
±0°WedOct 21
−2°−1°ThuOct 22
−1°FriOct 23
—SatOct 24

Bull Run weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 24 min less
Golden hour: 5:42–6:35 PM; Morning 7:11–8:05 AM
Blue hour: 6:35–6:46 PM; Morning 7:01–7:11 AM; first light 7:01 AM

Stars tonight? Fair

Mostly clear 7:16 PM–7:02 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:41 AM · rises 5:15 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Bull Run. The highest point on the skyline is about 4,000 ft, 53 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.