Frost Advisory
Starts in 8 h 40 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 3:45 PM EDT at KMTN

Bel Air South, MD weather

Sunny and 63°17°, jacket by 7 PM.

Forecasts agree

Now 63°17°

Sunny

Wind: Calm; Light through 4 AM
Dew point: 36°2°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 33Good; Ozone · tomorrow moderate
Pressure: 30.54 inHg1034 hPa; Falling · −0.05 inHg−1.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 50°10° tonight after 8 PM
Low 36°2° tomorrow at 6 AM
Above 50°10° tomorrow by 10 AM
Drops 12°7° tomorrow night 6–9 PM (59°15° → 47°8°)

This afternoonNear 62°17° · Clear
TonightDown to 37°3° by 5 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 3 PM · Clear
Tomorrow nightDown to 38°3° by 5 AM · Clear
Monday morningUp to 58°14° by 11 AM · Clear
Monday afternoonUp to 68°20° 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 4p	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	3 mph5 km/h from SE, gusts 5 mph7 km/h	39%	0%	1
Sat 5p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	3 mph5 km/h from SE, gusts 6 mph9 km/h	42%	0%	0
Sat 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	47%	0%	0
Sat 7p	Clear	53°12° (likely 51°11° to 53°12°)	53°12°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	59%	0%	0
Sat 8p	Clear	47°8° (likely 47°8° to 52°11°)	47°8°	0%	0 mph0 km/h, gusts 3 mph4 km/h	74%	0%	0
Sat 9p	Clear	45°7° (likely 45°7° to 51°11°)	45°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	79%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 50°10°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 50°10°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	92%	0%	0
Sun 12a	Clear	41°5° (likely 41°5° to 48°9°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	92%	0%	0
Sun 1a	Clear	40°4° (likely 40°4° to 47°8°)	40°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	96%	0%	0
Sun 2a	Clear	39°4° (likely 39°4° to 46°8°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	0%	0
Sun 3a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	0%	0
Sun 4a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	100%	0%	0
Sun 5a	Clear	37°3° (likely 37°3° to 44°7°)	37°3°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	100%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 44°7°)	36°2°	0%	1 mph2 km/h from N, gusts 6 mph9 km/h	100%	0%	0
Sun 7a	Sunny	36°2° (likely 36°2° to 43°6°)	36°2°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	100%	1%	0
Sun 8a	Sunny	37°3° (likely 37°3° to 44°7°)	37°3°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	100%	0%	0
Sun 9a	Sunny	43°6° (likely 43°6° to 48°9°)	43°6°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	89%	0%	1
Sun 10a	Sunny	51°11° (likely 51°11° to 54°12°)	51°11°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	71%	1%	2
Sun 11a	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	59%	2%	3
Sun 12p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	1 mph2 km/h from NE, gusts 5 mph7 km/h	51%	3%	4
Sun 1p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 3 mph6 km/h	48%	4%	4
Sun 2p	Sunny	64°18° (likely 63°17° to 64°18°)	64°18°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	45%	4%	4
Sun 3p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	2 mph3 km/h from S, gusts 6 mph9 km/h	45%	4%	4
Sun 4p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from S, gusts 6 mph10 km/h	48%	2%	3
Sun 5p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	52%	0%	1
Sun 6p	Clear	59°15° (likely 57°14° to 59°15°)	59°15°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	60%	0%	0
Sun 7p	Clear	52°11° (likely 52°11° to 54°12°)	52°11°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	74%	0%	0
Sun 8p	Clear	47°8° (likely 47°8° to 52°11°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	86%	0%	0
Sun 9p	Clear	45°7° (likely 45°7° to 51°11°)	45°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	93%	0%	0
Sun 10p	Clear	44°7° (likely 44°7° to 50°10°)	44°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	0%	0
Sun 11p	Clear	42°6° (likely 42°6° to 50°10°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 49°9°)	42°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	0%	0
Mon 1a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	1%	0
Mon 2a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	100%	1%	0
Mon 3a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	100%	0%	0
Mon 4a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	100%	1%	0
Mon 5a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	100%	3%	0
Mon 6a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	100%	11%	0
Mon 7a	Sunny	37°3° (likely 37°3° to 44°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	100%	10%	0
Mon 8a	Sunny	38°3° (likely 38°3° to 44°7°)	38°3°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	100%	10%	0
Mon 9a	Sunny	44°7° (likely 44°7° to 50°10°)	44°7°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	96%	7%	1
Mon 10a	Sunny	51°11° (likely 51°11° to 56°13°)	51°11°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	80%	4%	2
Mon 11a	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	67%	0%	3
Mon 12p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	60%	0%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 66°19°)	65°18°	0%	5 mph8 km/h from NW, gusts 9 mph14 km/h	52%	1%	4
Mon 2p	Sunny	67°19° (likely 67°19° to 68°20°)	67°19°	0%	6 mph10 km/h from NW, gusts 10 mph15 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 12 mph19 km/h	49%	1%	4

Days ahead

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

Today, Oct 24. Sunny. High 63°17°, low 36°2°. Typical 64°18° / 43°6°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
2. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 63. Southeast wind around 3 mph.
Tonight: Patchy fog between 2am and 4am, then areas of frost and patchy fog. Clear, with a low around 36. Northeast wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–63°17°
Low, likely
35°2°–40°4°
Typical high / low
64°18° / 43°6°
Wind
6 mph9 km/h, gusts 11 mph18 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 37°3°. Typical 64°18° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Day: Areas of frost and patchy fog before 9am. Sunny, with a high near 65. East wind around 2 mph.
Night: Clear, with a low around 37. West wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
36°2°–43°6°
Typical high / low
64°18° / 43°6°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 48°9°. Typical 63°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Official NWS forecast
Day: Patchy frost between 7am and 8am. Sunny, with a high near 70. Northwest wind 2 to 6 mph.
Night: Mostly clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
39°4°–48°9°
Typical high / low
63°17° / 42°6°
Wind
9 mph14 km/h, gusts 16 mph25 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 67°19°, low 43°6°. Typical 63°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 67.
Night: Mostly clear, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
43°6°–51°11°
Typical high / low
63°17° / 42°6°
Wind
11 mph18 km/h, gusts 24 mph38 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 64°18°, low 48°9°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–64°18°
Low, likely
38°3°–48°9°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 50°10°. Typical 62°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 47°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  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 68.
Night: Mostly clear, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
44°7°–50°10°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 73°23°, low 50°10°. Typical 62°17° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–74°23°
Low, likely
45°7°–50°10°
Typical high / low
62°17° / 41°5°
Wind
8 mph13 km/h, gusts 29 mph47 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 70°21°, low 50°10°. Typical 61°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–74°23°
Low, likely
49°9°–51°11°
Typical high / low
61°16° / 41°5°
Wind
7 mph12 km/h, gusts 29 mph47 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 69°21°, low 53°12°. Typical 61°16° / 40°4°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°17°
  30% chance · 0.07 in1.8 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–71°22°
Low, likely
51°11°–55°13°
Typical high / low
61°16° / 40°4°
Wind
11 mph18 km/h, gusts 22 mph35 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 70°21°, low 60°16°. Typical 60°16° / 40°4°. Rain 0.17 in4.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 64°18°
  20% chance · 0.08 in2 mm
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  20% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Cloudy, 67°19°
  30% chance · 0.02 in0.4 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°–74°23°
Low, likely
57°14°–67°19°
Typical high / low
60°16° / 40°4°
Wind
17 mph28 km/h, gusts 33 mph53 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 36°.
Tomorrow
Dry, high 65°, low 37°.
Monday
Dry, high 70°, low 48°, warming up.
Rest of week
Mostly dry, highs 64–73°.

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

Plumtree Run near Bel Air

2.2 mi

Below flood stage

Level: 1.1 ft
Flow: 4 cfs

Reading from Sat 2:25 PM · NWS gauge page

Wheel Creek Near Abingdon, MD

2.5 mi

Level: 1.6 ft
Flow: under 1 cfs

Reading from Sat 2:50 PM · NWS gauge page

Bynum Run near Abingdo

2.5 mi

Level: 2.6 ft

Reading from Sat 2:45 PM · NWS gauge page

Bynum Run at Bel Air

2.6 mi

Below flood stage

Level: 0.7 ft
Flow: under 1 cfs

Reading from Sat 3:15 PM · NWS gauge page

For your home

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

Heating this week

About 63% less heating than a typical week.

This week 33Typical 88

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 28
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 21 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Sun, 12:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

ABERDEEN PHILLIPS FLD · official normals 1991–2020 · records 1919–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

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

−8°−5°SunOct 18
−6°−4°MonOct 19
−1°TueOct 20
+6°+3°WedOct 21
+2°+1°ThuOct 22
+3°+2°FriOct 23
—SatOct 24

Bel Air South weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 49 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 26 min less
Golden hour: 5:36–6:30 PM; Morning 7:07–8:02 AM
Blue hour: 6:30–6:40 PM; Morning 6:57–7:07 AM; first light 6:57 AM

Stars tonight? Fair

Clear 6:40 PM–6:58 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:36 AM · rises 5:09 PM
Full moon: Oct 26
New moon: Nov 9

Looking north from Bel Air South. The highest point on the skyline is about 5,700 ft, 15 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