Frost Advisory
Starts in 6 h 29 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 5:53 PM EDT at KDMH

Garrison, MD weather

Sunny and 59°15°.

Mostly agree

Now 59°15°

Sunny

Wind: 5 mph8 km/h; From the southeast. Up to 5 mph8 km/h through 6 AM
Dew point: 40°4°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 31Good; Ozone · tomorrow moderate
Pressure: 30.53 inHg1034 hPa; Steady over the last 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 39°4° tomorrow at 7 AM
Above 50°10° tomorrow by 10 AM
High 64°18° tomorrow at 3 PM

TonightDown to 40°4° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 3 PM · Clear
Tomorrow nightDown to 42°6° by 4 AM · Clear
Monday morningUp to 60°16° by 11 AM · Clear
Monday afternoonUp to 69°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 6p	Clear	57°14° (likely 54°12° to 57°14°)	57°14°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	49%	0%	0
Sat 7p	Clear	53°12° (likely 50°10° to 53°12°)	53°12°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	57%	0%	0
Sat 8p	Clear	49°9° (likely 48°9° to 51°11°)	49°9°	0%	2 mph3 km/h from E, gusts 5 mph7 km/h	68%	0%	0
Sat 9p	Clear	48°9° (likely 47°8° to 49°9°)	48°9°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	71%	0%	0
Sat 10p	Clear	46°8° (likely 46°8° to 48°9°)	46°8°	0%	1 mph2 km/h from SE, gusts 5 mph7 km/h	76%	0%	0
Sat 11p	Clear	45°7° (likely 45°7° to 47°8°)	45°7°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	79%	0%	0
Sun 12a	Clear	44°7° (likely 44°7° to 46°8°)	44°7°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	82%	5%	0
Sun 1a	Clear	44°7° (likely 43°6° to 46°8°)	44°7°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	86%	4%	0
Sun 2a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	89%	0%	0
Sun 3a	Clear	42°6° (likely 42°6° to 44°7°)	42°6°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	89%	0%	0
Sun 4a	Clear	41°5° (likely 40°4° to 43°6°)	41°5°	0%	2 mph3 km/h from E, gusts 3 mph5 km/h	92%	0%	0
Sun 5a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	0%	0
Sun 6a	Clear	40°4° (likely 39°4° to 42°6°)	40°4°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	92%	0%	0
Sun 7a	Sunny	39°4° (likely 38°3° to 42°6°)	39°4°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	2%	0
Sun 8a	Sunny	40°4° (likely 39°4° to 42°6°)	40°4°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	3%	0
Sun 9a	Sunny	45°7° (likely 44°7° to 47°8°)	45°7°	0%	2 mph3 km/h from NE, gusts 4 mph6 km/h	79%	11%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 54°12°)	52°11°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	69%	5%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	62%	4%	3
Sun 12p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	53%	5%	4
Sun 1p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	48%	4%	4
Sun 2p	Sunny	63°17° (likely 62°17° to 65°18°)	63°17°	0%	2 mph3 km/h from S, gusts 5 mph9 km/h	46%	3%	4
Sun 3p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from S, gusts 6 mph9 km/h	45%	3%	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	45%	3%	3
Sun 5p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	2 mph3 km/h from S, gusts 7 mph11 km/h	48%	3%	1
Sun 6p	Clear	60°16° (likely 58°14° to 60°16°)	60°16°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	53%	1%	0
Sun 7p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	64%	0%	0
Sun 8p	Clear	51°11° (likely 51°11° to 53°12°)	51°11°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	77%	0%	0
Sun 9p	Clear	49°9° (likely 49°9° to 51°11°)	49°9°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	80%	0%	0
Sun 10p	Clear	47°8° (likely 47°8° to 50°10°)	47°8°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	86%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	1 mph2 km/h from SW, gusts 4 mph6 km/h	89%	0%	0
Mon 12a	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	93%	0%	0
Mon 1a	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	2 mph3 km/h from W, gusts 5 mph9 km/h	93%	2%	0
Mon 2a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	96%	4%	0
Mon 3a	Clear	43°6° (likely 43°6° to 45°7°)	41°5°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	93%	0%	0
Mon 4a	Clear	42°6° (likely 42°6° to 44°7°)	42°6°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	96%	0%	0
Mon 5a	Clear	42°6° (likely 42°6° to 44°7°)	42°6°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	96%	2%	0
Mon 6a	Clear	41°5° (likely 41°5° to 43°6°)	39°4°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	96%	7%	0
Mon 7a	Sunny	41°5° (likely 40°4° to 43°6°)	39°4°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	96%	11%	0
Mon 8a	Sunny	41°5° (likely 40°4° to 44°7°)	39°4°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	96%	11%	0
Mon 9a	Sunny	47°8° (likely 45°7° to 49°9°)	46°8°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	86%	16%	1
Mon 10a	Sunny	53°12° (likely 53°12° to 56°13°)	53°12°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	74%	10%	2
Mon 11a	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	60%	0%	3
Mon 12p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	54%	0%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 67°19°)	65°18°	0%	5 mph8 km/h from NW, gusts 10 mph17 km/h	50%	1%	4
Mon 2p	Sunny	67°19° (likely 67°19° to 68°20°)	67°19°	0%	6 mph10 km/h from NW, gusts 10 mph17 km/h	47%	1%	4
Mon 3p	Sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	7 mph11 km/h from NW, gusts 12 mph19 km/h	44%	5%	4
Mon 4p	Sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 12 mph19 km/h	45%	0%	3
Mon 5p	Sunny	69°21° (likely 66°19° to 69°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 12 mph20 km/h	47%	0%	1

Days ahead

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

Today, Oct 24. Sunny. High 61°16°, low 37°3°. Typical 66°19° / 49°9°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Tonight: Clear, with a low around 37. Southeast wind 1 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–62°17°
Low, likely
35°2°–38°3°
Typical high / low
66°19° / 49°9°
Wind
7 mph11 km/h, gusts 13 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 65°18°, low 40°4°. Typical 65°18° / 49°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Day: Sunny, with a high near 65. Southeast wind around 2 mph.
Night: Clear, with a low around 40. Southwest wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
38°3°–42°6°
Typical high / low
65°18° / 49°9°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 49°9°. Typical 65°18° / 49°9°. 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, 51°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. Northwest wind 3 to 7 mph.
Night: Mostly clear, with a low around 49. Northwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
40°4°–49°9°
Typical high / low
65°18° / 49°9°
Wind
8 mph12 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 67°19°, low 44°7°. Typical 65°18° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 45°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 44.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–67°19°
Low, likely
44°7°–50°10°
Typical high / low
65°18° / 48°9°
Wind
9 mph15 km/h, gusts 23 mph37 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 64°18°, low 48°9°. Typical 64°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 45°7°
  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, 49°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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
41°5°–48°9°
Typical high / low
64°18° / 48°9°
Wind
7 mph11 km/h, gusts 17 mph27 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 50°10°. Typical 64°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Night: Mostly clear, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
46°8°–50°10°
Typical high / low
64°18° / 48°9°
Wind
8 mph12 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 51°11°. Typical 64°18° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  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 74.
Night: Mostly clear, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–74°23°
Low, likely
46°8°–52°11°
Typical high / low
64°18° / 47°8°
Wind
8 mph13 km/h, gusts 27 mph43 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 71°22°, low 50°10°. Typical 63°17° / 47°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  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 71.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–71°22°
Low, likely
46°8°–53°12°
Typical high / low
63°17° / 47°8°
Wind
9 mph14 km/h, gusts 28 mph45 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 68°20°, low 52°11°. Typical 63°17° / 47°8°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 62°17°
  30% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.1 in2.6 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
48°9°–54°12°
Typical high / low
63°17° / 47°8°
Wind
9 mph15 km/h, gusts 21 mph34 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 70°21°, low 59°15°. Typical 62°17° / 46°8°. Rain 0.33 in8.4 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  30% chance · 0.06 in1.4 mm
2. Afternoon
  noon–6 PM
  Drizzle, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  20% chance · 0.18 in4.7 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°–76°24°
Low, likely
56°13°–67°19°
Typical high / low
62°17° / 46°8°
Wind
15 mph24 km/h, gusts 35 mph57 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 37°.
Tomorrow
Dry, high 65°, low 40°, warming up.
Monday
Dry, high 70°, low 49°, warming up.
Rest of week
Mostly dry, highs 64–74°.

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

RED RUN NEAR OWINGS MILLS, MD

1.5 mi

Level: 1.1 ft

Reading from Sat 5:05 PM · NWS gauge page

Scotts Level Branch at Rockdale

2.9 mi

Below flood stage

Level: 0.7 ft

Reading from Sat 5:50 PM · NWS gauge page

Gwynns Falls near Delight

3.3 mi

Below flood stage

Level: 0.1 ft
Flow: 4 cfs

Reading from Sat 4:50 PM · NWS gauge page

Gwynns Falls at Villa Nova

4.0 mi

Below flood stage

Level: 0.8 ft
Flow: 10 cfs

Reading from Sat 5:35 PM · NWS gauge page

For your home

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

Heating this week

About 53% less heating than a typical week.

This week 28Typical 60

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 12 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 40°F).

Open the windows?

Sun, 12:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Maryland Science Center · official normals 1991–2020 · records 1950–2026

Oct 24, today vs a typical year

Today’s expected high is 5°3° colder than typical.

Last 7 days vs normal

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

−7°−4°SunOct 18
−3°−2°MonOct 19
+4°+2°TueOct 20
+2°+1°WedOct 21
+2°+1°ThuOct 22
±0°FriOct 23
—SatOct 24

Garrison 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: 5:38–6:32 PM; Morning 7:09–8:03 AM
Blue hour: 6:32–6:42 PM; Morning 6:59–7:09 AM; first light 6:59 AM

Stars tonight? Fair

Clear 6:42 PM–7 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:38 AM · rises 5:11 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Garrison. The highest point on the skyline is about 2,400 ft, 16 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

Garrison, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

RED RUN NEAR OWINGS MILLS, MD

Scotts Level Branch at Rockdale

Gwynns Falls near Delight

Gwynns Falls at Villa Nova

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon