Frost Advisory
Starts in 4 h 7 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 7:53 PM EDT at KDMH

Mays Chapel, MD weather

Clear and 55°13°.

Forecasts agree

Now 55°13°

Clear

Wind: Calm; Light through 8 AM
Dew point: 39°4°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 20Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.55 inHg1035 hPa; Rising slowly · +0.02 inHg+0.7 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 40°4° tomorrow at 6 AM
Above 50°10° tomorrow by 10 AM
High 64°18° tomorrow at 3 PM
Below 50°10° tomorrow night after 9 PM

TonightDown to 41°5° 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 5 AM · Clear
Monday morningUp to 59°15° by 11 AM · Clear
Monday afternoonUp to 68°20° 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 8p	Clear	49°9° (likely 47°8° to 50°10°)	49°9°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	68%	0%	0
Sat 9p	Clear	48°9° (likely 46°8° to 49°9°)	48°9°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	71%	0%	0
Sat 10p	Clear	47°8° (likely 45°7° to 48°9°)	47°8°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	74%	0%	0
Sat 11p	Clear	46°8° (likely 44°7° to 47°8°)	46°8°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	76%	0%	0
Sun 12a	Clear	45°7° (likely 43°6° to 46°8°)	45°7°	0%	1 mph2 km/h from SE, gusts 3 mph4 km/h	82%	0%	0
Sun 1a	Clear	44°7° (likely 42°6° to 45°7°)	44°7°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	86%	0%	0
Sun 2a	Clear	43°6° (likely 41°5° to 45°7°)	43°6°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	86%	1%	0
Sun 3a	Clear	42°6° (likely 40°4° to 44°7°)	42°6°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	93%	1%	0
Sun 4a	Clear	42°6° (likely 39°4° to 43°6°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	89%	0%	0
Sun 5a	Clear	41°5° (likely 38°3° to 42°6°)	41°5°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	92%	0%	0
Sun 6a	Clear	40°4° (likely 37°3° to 42°6°)	40°4°	0%	1 mph2 km/h from N, gusts 4 mph6 km/h	92%	0%	0
Sun 7a	Sunny	40°4° (likely 36°2° to 41°5°)	40°4°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	0%	0
Sun 8a	Sunny	40°4° (likely 37°3° to 41°5°)	40°4°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	92%	0%	0
Sun 9a	Sunny	45°7° (likely 43°6° to 46°8°)	45°7°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	82%	0%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 53°12°)	52°11°	0%	1 mph2 km/h from SE, gusts 3 mph4 km/h	66%	0%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	59%	1%	3
Sun 12p	Sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	53%	2%	4
Sun 1p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	46%	2%	4
Sun 2p	Sunny	63°17° (likely 63°17° to 64°18°)	63°17°	0%	2 mph3 km/h from S, gusts 4 mph7 km/h	44%	2%	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	43%	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%	6%	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	46%	4%	1
Sun 6p	Clear	60°16° (likely 57°14° to 60°16°)	60°16°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	51%	1%	0
Sun 7p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	62%	0%	0
Sun 8p	Clear	51°11° (likely 50°10° to 53°12°)	51°11°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	74%	0%	0
Sun 9p	Clear	49°9° (likely 48°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 3 mph5 km/h	86%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	89%	1%	0
Mon 12a	Clear	45°7° (likely 45°7° to 47°8°)	45°7°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	89%	0%	0
Mon 1a	Clear	45°7° (likely 44°7° to 47°8°)	45°7°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	89%	2%	0
Mon 2a	Clear	44°7° (likely 43°6° to 46°8°)	44°7°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	93%	4%	0
Mon 3a	Clear	44°7° (likely 42°6° to 45°7°)	44°7°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	93%	0%	0
Mon 4a	Clear	43°6° (likely 41°5° to 45°7°)	43°6°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	96%	2%	0
Mon 5a	Clear	42°6° (likely 40°4° to 44°7°)	40°4°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	96%	6%	0
Mon 6a	Clear	42°6° (likely 39°4° to 43°6°)	40°4°	0%	3 mph5 km/h from NW, gusts 8 mph12 km/h	96%	8%	0
Mon 7a	Sunny	42°6° (likely 39°4° to 43°6°)	42°6°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	96%	13%	0
Mon 8a	Sunny	42°6° (likely 39°4° to 44°7°)	40°4°	0%	3 mph5 km/h from NW, gusts 8 mph13 km/h	96%	13%	0
Mon 9a	Sunny	47°8° (likely 44°7° to 49°9°)	46°8°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	86%	15%	1
Mon 10a	Sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	71%	11%	2
Mon 11a	Sunny	59°15° (likely 59°15° to 62°17°)	59°15°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	62%	1%	3
Mon 12p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	54%	7%	4
Mon 1p	Sunny	64°18° (likely 64°18° to 67°19°)	64°18°	0%	6 mph10 km/h from NW, gusts 10 mph16 km/h	50%	0%	4
Mon 2p	Sunny	66°19° (likely 66°19° to 68°20°)	66°19°	0%	7 mph11 km/h from NW, gusts 10 mph16 km/h	47%	3%	4
Mon 3p	Sunny	67°19° (likely 66°19° to 69°21°)	67°19°	0%	7 mph11 km/h from NW, gusts 11 mph18 km/h	45%	0%	4
Mon 4p	Sunny	68°20° (likely 65°18° to 68°20°)	68°20°	0%	5 mph8 km/h from NW, gusts 12 mph19 km/h	45%	0%	3
Mon 5p	Sunny	68°20° (likely 64°18° to 68°20°)	68°20°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	47%	0%	1
Mon 6p	Clear	65°18° (likely 60°16° to 65°18°)	65°18°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	52%	0%	0
Mon 7p	Clear	61°16° (likely 55°13° to 61°16°)	61°16°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	62%	0%	0

Days ahead

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

Today, Oct 24. Partly sunny. High 61°16°, low 38°3°. Typical 66°19° / 49°9°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Tonight: Clear, with a low around 38. South wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–62°17°
Low, likely
36°2°–38°3°
Typical high / low
66°19° / 49°9°
Wind
6 mph9 km/h, gusts 12 mph19 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 41°5°. 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 64. South wind around 2 mph.
Night: Clear, with a low around 41. Southwest wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
36°2°–41°5°
Typical high / low
65°18° / 49°9°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 49°9°. Typical 65°18° / 49°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  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, 51°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 69. Northwest wind 2 to 7 mph.
Night: Mostly clear, with a low around 49. Northwest wind 3 to 7 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
38°3°–49°9°
Typical high / low
65°18° / 49°9°
Wind
8 mph12 km/h, gusts 20 mph32 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 44°7°. Typical 65°18° / 48°9°. 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, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Mostly clear, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
44°7°–51°11°
Typical high / low
65°18° / 48°9°
Wind
9 mph15 km/h, gusts 23 mph36 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 63°17°, low 47°8°. Typical 64°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°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 63.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–63°17°
Low, likely
41°5°–47°8°
Typical high / low
64°18° / 48°9°
Wind
7 mph11 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 50°10°. Typical 64°18° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°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, 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.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–69°21°
Low, likely
45°7°–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 73°23°, low 50°10°. 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, 62°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 73.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
45°7°–53°12°
Typical high / low
64°18° / 47°8°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 70°21°, low 50°10°. Typical 63°17° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 49°10°
  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 70.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–70°21°
Low, likely
46°8°–56°13°
Typical high / low
63°17° / 47°8°
Wind
9 mph14 km/h, gusts 18 mph29 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 69°21°, low 51°11°. Typical 63°17° / 47°8°. Rain 0.02 in0.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  30% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.12 in3.1 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
66°19°–72°22°
Low, likely
48°9°–54°12°
Typical high / low
63°17° / 47°8°
Wind
9 mph15 km/h, gusts 29 mph47 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 71°22°, low 59°15°. Typical 62°17° / 46°8°. Rain 0.25 in6.4 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 62°17°
  30% chance · 0.09 in2.4 mm
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 64°18°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–74°23°
Low, likely
56°13°–66°19°
Typical high / low
62°17° / 46°8°
Wind
14 mph22 km/h, gusts 34 mph54 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 38°.
Tomorrow
Dry, high 64°, low 41°, warming up.
Monday
Dry, high 69°, low 49°, warming up.
Rest of week
Mostly dry, highs 63–73°.

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

Baisman Run at Broadmoor

2.8 mi

Below flood stage

Level: 1.1 ft
Flow: under 1 cfs

Reading from Sat 7:20 PM · NWS gauge page

Beaverdam Run at Cockeysville

3.1 mi

Below flood stage

Level: 3.1 ft
Flow: 251 cfs

Reading from Sat 7:25 PM · NWS gauge page

Jones Falls at Sorrento

3.2 mi

Below flood stage

Level: 7.8 ft
Flow: 34 cfs

Reading from Sat 7:15 PM · NWS gauge page

Long Quarter Branch at Lutherville

3.5 mi

Below flood stage

Level: 1.0 ft

Reading from Sat 7:30 PM · NWS gauge page

For your home

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

Heating this week

About 55% less heating than a typical week.

This week 27Typical 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 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Sun, 1:00 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° warmer than normal (daily mean temperature).

−3°−2°MonOct 19
+4°+2°TueOct 20
+2°+1°WedOct 21
+2°+1°ThuOct 22
±0°FriOct 23
—SatOct 24
—SunOct 25

Mays Chapel 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: 5:37–6:31 PM; Morning 7:09–8:03 AM
Blue hour: 6:31–6:42 PM; Morning 6:58–7:09 AM; first light 6:58 AM

Stars tonight? Fair

Clear 8:53 PM–6:59 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 west from Mays Chapel. A level horizon.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

Mays Chapel, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Baisman Run at Broadmoor

Beaverdam Run at Cockeysville

Jones Falls at Sorrento

Long Quarter Branch at Lutherville

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