Frost Advisory
Starts in 6 h 59 min
When
From 1 AM to 9 AM EDT Sunday.
Where
Portions of central, northeast, and northern Maryland and northern Virginia.
Issued for this forecast zone · National Weather Service Baltimore MD/Washington DC
What, impacts and precautionsHide details
What
Temperatures as low as 33 will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Frederick; Carroll; Northern Baltimore; Cecil; Northwest Montgomery; Northwest Howard; Northwest Harford; Southeast Harford; Rappahannock; Culpeper; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park
See it on weather.gov (opens in a new tab)

Observed 4:55 PM EDT at KDAA

Potomac Mills, VA weather

Mostly cloudy and 64°18°, jacket by 8 PM.

Mostly agree

Now 64°18°

Mostly cloudy

Wind: 7 mph11 km/h; From the south-southeast. Up to 7 mph11 km/h through 6 AM
Dew point: 41°5°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 32Good; Ozone · tomorrow moderate
Pressure: 30.46 inHg1031 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (63°17° then, 64°18° now)

Good hours for

Low 40°4° tomorrow at 7 AM
Above 50°10° tomorrow by 10 AM
High 66°19° tomorrow at 3 PM

TonightDown to 41°5° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 66°19° by 3 PM · Clear
Tomorrow nightDown to 41°5° by 5 AM · Clear
Monday morningUp to 57°14° by 11 AM · Clear
Monday afternoonUp to 69°21° by 4 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 6p	Mostly clear	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from E, gusts 10 mph16 km/h	51%	22%	0
Sat 7p	Clear	56°13° (likely 54°12° to 57°14°)	56°13°	0%	3 mph5 km/h from E, gusts 8 mph12 km/h	62%	13%	0
Sat 8p	Clear	53°12° (likely 52°11° to 54°12°)	53°12°	0%	3 mph5 km/h from E, gusts 7 mph12 km/h	74%	8%	0
Sat 9p	Clear	50°10° (likely 50°10° to 51°11°)	49°9°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	83%	9%	0
Sat 10p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	2 mph3 km/h from NE, gusts 5 mph9 km/h	86%	10%	0
Sat 11p	Partly cloudy	47°8° (likely 47°8° to 50°10°)	47°8°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	89%	25%	0
Sun 12a	Clear	46°8° (likely 46°8° to 49°9°)	45°7°	0%	3 mph5 km/h from NE, gusts 4 mph6 km/h	93%	13%	0
Sun 1a	Mostly clear	46°8° (likely 46°8° to 49°9°)	45°7°	0%	3 mph5 km/h from N, gusts 3 mph5 km/h	89%	23%	0
Sun 2a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	93%	7%	0
Sun 3a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	96%	4%	0
Sun 4a	Mostly clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	100%	36%	0
Sun 5a	Partly cloudy	41°5° (likely 41°5° to 47°8°)	41°5°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	96%	44%	0
Sun 6a	Partly cloudy	41°5° (likely 41°5° to 47°8°)	39°4°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	96%	33%	0
Sun 7a	Sunny	40°4° (likely 40°4° to 48°9°)	38°3°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	96%	40%	0
Sun 8a	Sunny	40°4° (likely 40°4° to 48°9°)	38°3°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	100%	38%	0
Sun 9a	Mostly sunny	45°7° (likely 45°7° to 51°11°)	45°7°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	93%	18%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 55°13°)	52°11°	0%	2 mph3 km/h from NE, gusts 7 mph11 km/h	77%	23%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	2 mph3 km/h from NE, gusts 6 mph9 km/h	72%	5%	3
Sun 12p	Sunny	59°15° (likely 59°15° to 62°17°)	59°15°	0%	2 mph3 km/h from E, gusts 5 mph9 km/h	62%	5%	4
Sun 1p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	54%	2%	4
Sun 2p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	50%	3%	4
Sun 3p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	47%	4%	4
Sun 4p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	47%	3%	3
Sun 5p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	50%	2%	2
Sun 6p	Clear	62°17° (likely 59°15° to 63°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	54%	0%	0
Sun 7p	Clear	57°14° (likely 56°13° to 58°14°)	57°14°	0%	2 mph3 km/h from E, gusts 2 mph3 km/h	64%	0%	0
Sun 8p	Clear	52°11° (likely 52°11° to 56°13°)	52°11°	0%	2 mph3 km/h from E, gusts 3 mph5 km/h	77%	0%	0
Sun 9p	Clear	50°10° (likely 50°10° to 54°12°)	50°10°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	86%	1%	0
Sun 10p	Clear	48°9° (likely 48°9° to 53°12°)	48°9°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	93%	2%	0
Sun 11p	Clear	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	93%	6%	0
Mon 12a	Clear	45°7° (likely 45°7° to 50°10°)	45°7°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	96%	5%	0
Mon 1a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	96%	1%	0
Mon 2a	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	96%	4%	0
Mon 3a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	96%	11%	0
Mon 4a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	96%	12%	0
Mon 5a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	100%	11%	0
Mon 6a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	2 mph3 km/h from W, gusts 9 mph15 km/h	96%	13%	0
Mon 7a	Sunny	40°4° (likely 40°4° to 45°7°)	40°4°	0%	2 mph3 km/h from W, gusts 8 mph14 km/h	100%	20%	0
Mon 8a	Sunny	41°5° (likely 41°5° to 45°7°)	41°5°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	96%	21%	0
Mon 9a	Sunny	45°7° (likely 45°7° to 50°10°)	45°7°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	93%	18%	1
Mon 10a	Sunny	51°11° (likely 51°11° to 57°14°)	51°11°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	80%	15%	2
Mon 11a	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	67%	7%	3
Mon 12p	Sunny	61°16° (likely 61°16° to 64°18°)	61°16°	0%	5 mph8 km/h from NW, gusts 8 mph13 km/h	60%	6%	4
Mon 1p	Sunny	64°18° (likely 64°18° to 66°19°)	64°18°	0%	5 mph8 km/h from NW, gusts 8 mph13 km/h	54%	0%	4
Mon 2p	Sunny	66°19° (likely 66°19° to 68°20°)	66°19°	0%	5 mph8 km/h from NW, gusts 8 mph14 km/h	50%	0%	4
Mon 3p	Sunny	68°20° (likely 68°20° to 69°21°)	68°20°	0%	6 mph10 km/h from NW, gusts 10 mph17 km/h	47%	0%	4
Mon 4p	Sunny	69°21° (likely 68°20° to 69°21°)	69°21°	0%	3 mph5 km/h from NW, gusts 10 mph17 km/h	45%	0%	3
Mon 5p	Sunny	69°21° (likely 66°19° to 69°21°)	69°21°	0%	2 mph3 km/h from NW, gusts 9 mph15 km/h	47%	0%	2

Days ahead

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

Today, Oct 24. Partly sunny. High 63°17°, low 38°3°. Typical 66°19° / 46°8°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Tonight: Partly cloudy, with a low around 38. Northeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
37°3°–41°5°
Typical high / low
66°19° / 46°8°
Wind
6 mph10 km/h, gusts 13 mph21 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 66°19°, low 39°4°. Typical 66°19° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Sunny, with a high near 66. Northeast wind around 3 mph.
Night: Clear, with a low around 39. Southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–66°19°
Low, likely
39°4°–46°8°
Typical high / low
66°19° / 46°8°
Wind
5 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 49°9°. Typical 65°18° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°10°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. Northwest wind 2 to 6 mph.
Night: Mostly clear, with a low around 49. Northwest wind 1 to 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
41°5°–49°9°
Typical high / low
65°18° / 46°8°
Wind
7 mph11 km/h, gusts 14 mph22 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 69°21°, low 47°8°. Typical 65°18° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  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 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–69°21°
Low, likely
46°8°–51°11°
Typical high / low
65°18° / 45°7°
Wind
8 mph13 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 67°19°, low 48°9°. Typical 64°18° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 67.
Night: Mostly cloudy, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
46°8°–49°9°
Typical high / low
64°18° / 45°7°
Wind
6 mph9 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 71°22°, low 50°10°. Typical 64°18° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°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 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–71°22°
Low, likely
46°8°–50°10°
Typical high / low
64°18° / 45°7°
Wind
6 mph9 km/h, gusts 20 mph32 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 75°24°, low 52°11°. Typical 64°18° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  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 52.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
46°8°–52°11°
Typical high / low
64°18° / 44°7°
Wind
6 mph10 km/h, gusts 25 mph40 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 72°22°, low 50°10°. Typical 63°17° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  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
64°18°–72°22°
Low, likely
47°8°–53°12°
Typical high / low
63°17° / 44°7°
Wind
7 mph12 km/h, gusts 25 mph40 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 68°20°, low 53°12°. Typical 63°17° / 44°7°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 67°19°
  30% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.04 in0.9 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°17°
  30% chance · 0.05 in1.2 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
62°17°–74°23°
Low, likely
51°11°–56°13°
Typical high / low
63°17° / 44°7°
Wind
9 mph15 km/h, gusts 19 mph30 km/h
UV peak
1
Monday, Nov 2. Drizzle. High 72°22°, low 60°16°. Typical 63°17° / 43°6°. Rain 0.25 in6.4 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  Dry
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°–78°26°
Low, likely
57°14°–66°19°
Typical high / low
63°17° / 43°6°
Wind
17 mph28 km/h, gusts 37 mph60 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 38°.
Tomorrow
Dry, high 66°, low 39°, warming up.
Monday
Dry, high 70°, low 49°, warming up.
Rest of week
Mostly dry, highs 67–75°.

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

Easy Creek at Prince William Parkway

2.0 mi

Level: 0.0 ft

Reading from Sat 5:10 PM · NWS gauge page

Potomac River at Leesylvania State Park

5.3 mi

Below flood stage

Level: 3.6 ft

Reading from Sat 4:50 PM · NWS gauge page

South Run at Lake Mercer

6.1 mi

Below flood stage

Level: 217 ft

Reading from Sat 11:15 AM · NWS gauge page

Quantico Creek at Dumfries

6.4 mi

Level: 2.6 ft

Reading from Sat 4:45 PM · NWS gauge page

For your home

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

Heating this week

About 61% less heating than a typical week.

This week 27Typical 70

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 22
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 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 41°F).

Open the windows?

Sun, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Quantico Mcas · official normals 1991–2020 · records 1945–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

On average 1°0° colder than normal (daily mean temperature).

−6°−3°SunOct 18
−3°−2°MonOct 19
+4°+2°TueOct 20
+1°±0°WedOct 21
+2°+1°ThuOct 22
±0°FriOct 23
—SatOct 24

Potomac Mills weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 51 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:41–6:35 PM; Morning 7:10–8:04 AM
Blue hour: 6:35–6:45 PM; Morning 7:00–7:10 AM; first light 7:00 AM

Stars tonight? Fair

Mostly clear 6:45–11 PM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:40 AM · rises 5:14 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Potomac Mills. The highest point on the skyline is about 2,800 ft, 40 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Frost Advisory