Frost Advisory
Starts in 55 min
When
Until 9 AM EDT Sunday.
Where
In Maryland, Central and Southeast Howard and Central and Southeast Montgomery Counties. In Virginia, Orange, Spotsylvania, Fairfax, Stafford, and Madison Counties.
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: Central and Southeast Montgomery; Central and Southeast Howard; Madison; Orange; Fairfax; Stafford; Spotsylvania
See it on weather.gov (opens in a new tab)

Observed 11:50 PM EDT at KBWI

Ilchester, MD weather

Clear and 45°7°.

Forecasts agree

Now 45°7°

Clear

Wind: Calm; Light through 12 PM
Dew point: 43°6°; Comfortable
Humidity: 93%; Air 45°7°, dew point 43°6° · fog or dew likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 65Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.55 inHg1035 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 41°5° today at 6 AM
Above 50°10° today by 10 AM
High 65°18° today at 3 PM

TonightDown to 42°6° by 4 AM · Clear
This morningUp to 56°13° by 11 AM · Clear
This afternoonUp to 65°18° by 3 PM · Clear
TonightDown to 41°5° by 5 AM · Clear
Tomorrow morningUp to 59°15° by 11 AM · Clear
Tomorrow afternoonUp to 69°21° by 3 PM · Clear
Tomorrow nightDown to 52°11° by 11 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
Sun 12a	Clear	46°8° (likely 44°7° to 47°8°)	46°8°	0%	1 mph2 km/h from NE, gusts 3 mph5 km/h	83%	4%	0
Sun 1a	Clear	45°7° (likely 43°6° to 47°8°)	45°7°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	86%	2%	0
Sun 2a	Clear	44°7° (likely 43°6° to 45°7°)	44°7°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	89%	0%	0
Sun 3a	Clear	43°6° (likely 42°6° to 44°7°)	43°6°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	89%	0%	0
Sun 4a	Clear	42°6° (likely 41°5° to 43°6°)	42°6°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	93%	0%	0
Sun 5a	Clear	42°6° (likely 40°4° to 43°6°)	42°6°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	89%	0%	0
Sun 6a	Clear	41°5° (likely 40°4° to 43°6°)	41°5°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	0%	0
Sun 7a	Sunny	41°5° (likely 40°4° to 42°6°)	41°5°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	92%	0%	0
Sun 8a	Sunny	41°5° (likely 40°4° to 42°6°)	41°5°	0%	2 mph3 km/h from N, gusts 4 mph6 km/h	89%	0%	0
Sun 9a	Sunny	46°8° (likely 45°7° to 47°8°)	46°8°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	83%	0%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 55°13°)	52°11°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	74%	0%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	2 mph3 km/h from E, gusts 4 mph7 km/h	66%	2%	3
Sun 12p	Sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	55%	2%	4
Sun 1p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	2 mph3 km/h from SE, gusts 5 mph9 km/h	50%	2%	4
Sun 2p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	46%	4%	4
Sun 3p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	43%	5%	4
Sun 4p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from SE, gusts 6 mph9 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 5 mph8 km/h	48%	6%	1
Sun 6p	Clear	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	53%	2%	0
Sun 7p	Clear	57°14° (likely 54°12° to 57°14°)	57°14°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	62%	0%	0
Sun 8p	Clear	52°11° (likely 51°11° to 53°12°)	52°11°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	74%	0%	0
Sun 9p	Clear	50°10° (likely 49°9° to 51°11°)	50°10°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	77%	0%	0
Sun 10p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	83%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	89%	0%	0
Mon 12a	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	93%	0%	0
Mon 1a	Clear	45°7° (likely 45°7° to 47°8°)	45°7°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	93%	0%	0
Mon 2a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	96%	0%	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%	0%	0
Mon 4a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	96%	3%	0
Mon 5a	Clear	41°5° (likely 41°5° to 45°7°)	39°4°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	100%	7%	0
Mon 6a	Clear	41°5° (likely 40°4° to 44°7°)	39°4°	0%	3 mph5 km/h from W, gusts 7 mph10 km/h	96%	10%	0
Mon 7a	Sunny	41°5° (likely 40°4° to 44°7°)	39°4°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	96%	12%	0
Mon 8a	Sunny	41°5° (likely 39°4° to 44°7°)	39°4°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	96%	12%	0
Mon 9a	Sunny	46°8° (likely 45°7° to 49°9°)	45°7°	0%	3 mph5 km/h from W, gusts 7 mph12 km/h	89%	12%	1
Mon 10a	Sunny	52°11° (likely 52°11° to 56°13°)	52°11°	0%	3 mph5 km/h from W, gusts 10 mph16 km/h	77%	4%	2
Mon 11a	Sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	62%	8%	3
Mon 12p	Sunny	62°17° (likely 62°17° to 65°18°)	62°17°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	56%	0%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 68°20°)	65°18°	0%	6 mph10 km/h from NW, gusts 10 mph16 km/h	48%	0%	4
Mon 2p	Sunny	67°19° (likely 67°19° to 69°21°)	67°19°	0%	6 mph10 km/h from NW, gusts 11 mph17 km/h	45%	0%	4
Mon 3p	Sunny	69°21° (likely 68°20° to 70°21°)	69°21°	0%	7 mph11 km/h from NW, gusts 11 mph17 km/h	44%	1%	4
Mon 4p	Sunny	69°21° (likely 68°20° to 69°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 10 mph17 km/h	45%	0%	3
Mon 5p	Sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 11 mph18 km/h	47%	0%	1
Mon 6p	Clear	66°19° (likely 63°17° to 66°19°)	66°19°	0%	5 mph8 km/h from NW, gusts 7 mph11 km/h	52%	0%	0
Mon 7p	Clear	63°17° (likely 57°14° to 63°17°)	63°17°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	58%	0%	0
Mon 8p	Clear	59°15° (likely 53°12° to 59°15°)	59°15°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	67%	2%	0
Mon 9p	Clear	56°13° (likely 51°11° to 61°16°)	56°13°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	74%	0%	0
Mon 10p	Clear	54°12° (likely 49°9° to 60°16°)	54°12°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	77%	0%	0
Mon 11p	Clear	52°11° (likely 48°9° to 59°15°)	52°11°	0%	5 mph8 km/h from NW, gusts 10 mph17 km/h	83%	1%	0

Days ahead

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

Today, Oct 25. Sunny. High 65°18°, low 38°3°. Typical 65°18° / 49°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Today: Sunny, with a high near 65. East wind around 2 mph.
Tonight: Clear, with a low around 38. North wind around 2 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 mph10 km/h
UV peak
4
Tomorrow, Oct 26. Sunny. High 70°21°, low 50°10°. 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, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. West wind 3 to 7 mph.
Night: Clear, with a low around 50. Northwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
39°4°–50°10°
Typical high / low
65°18° / 49°9°
Wind
7 mph11 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 67°19°, low 46°8°. Typical 65°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  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 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
46°8°–53°12°
Typical high / low
65°18° / 48°9°
Wind
8 mph13 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 64°18°, low 49°9°. Typical 64°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  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 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
42°6°–50°10°
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 71°22°, low 49°9°. Typical 64°18° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°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 71.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–71°22°
Low, likely
45°7°–51°11°
Typical high / low
64°18° / 48°9°
Wind
7 mph11 km/h, gusts 23 mph37 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, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°17°
  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 74.
Night: Mostly clear, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
74°23°–76°24°
Low, likely
45°7°–53°12°
Typical high / low
64°18° / 47°8°
Wind
7 mph11 km/h, gusts 14 mph23 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 71°22°, low 51°11°. Typical 63°17° / 47°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°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
62°17°–71°22°
Low, likely
45°7°–58°14°
Typical high / low
63°17° / 47°8°
Wind
8 mph13 km/h, gusts 17 mph28 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 70°21°, low 53°12°. Typical 63°17° / 47°8°. Rain 0.03 in0.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 71°21°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  20% chance · 0.04 in1.1 mm
4. Overnight
  midnight–6 AM
  Showers, 62°17°
  30% chance · 0.1 in2.7 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–73°23°
Low, likely
49°9°–55°13°
Typical high / low
63°17° / 47°8°
Wind
10 mph15 km/h, gusts 28 mph44 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 73°23°, low 61°16°. Typical 62°17° / 46°8°. Rain 0.22 in5.6 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Showers, 63°17°
  20% chance · 0.08 in2.1 mm
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 65°18°
  20% chance · 0.06 in1.6 mm
4. Overnight
  midnight–6 AM
  Drizzle, 58°15°
  20% chance · 0.16 in4 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
71°22°–78°26°
Low, likely
57°14°–68°20°
Typical high / low
62°17° / 46°8°
Wind
16 mph26 km/h, gusts 39 mph63 km/h
UV peak
3
Tuesday, Nov 3. Cloudy. High 71°22°, low 57°14°. Typical 62°17° / 46°8°. Rain 0.1 in2.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 60°15°
  20% chance · 0.03 in0.9 mm
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 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
67°19°–78°26°
Low, likely
55°13°–60°16°
Typical high / low
62°17° / 46°8°
Wind
15 mph23 km/h, gusts 34 mph55 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 65°, low 38°.
Tomorrow
Dry, high 70°, low 50°, warming up.
Tuesday
Dry, high 67°, low 46°, cooling off.
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

Patapsco River near Elkridge at Patapsco Valley State Park

2.2 mi

Below flood stage

Level: 5.5 ft
Flow: 91 cfs

Reading from Sat 10 PM · NWS gauge page

Patapsco River near Catonsville

2.4 mi

Below flood stage

Level: 10.4 ft
Flow: 59 cfs

Reading from Sat 10:30 PM · NWS gauge page

Patapsco River near Elkridge below Patapsco Valley State Park

3.1 mi

Below flood stage

Level: 7.7 ft

Reading from Sat 10:15 PM · NWS gauge page

Patapsco River at Ellicott City

4.0 mi

Below flood stage

Level: 114 ft

Reading from Sat 10 PM · NWS gauge page

For your home

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

Heating this week

About 60% less heating than a typical week.

This week 25Typical 62

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 20
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 43°F).

Open the windows?

Today, 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 25, today vs a typical year

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

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

Ilchester weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 47 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:37–6:31 PM; Morning 7:10–8:04 AM
Blue hour: 6:31–6:41 PM; Morning 6:59–7:10 AM; first light 6:59 AM

Stars tonight? Fair

Clear 12:05–6:59 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

99% lit · growing

Today: sets 6:49 AM · rises 5:40 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Ilchester. 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

Ilchester, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Tuesday

Rest of week

What changed since yesterday

Radar

Rivers

Patapsco River near Elkridge at Patapsco Valley State Park

Patapsco River near Catonsville

Patapsco River near Elkridge below Patapsco Valley State Park

Patapsco River at Ellicott City

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 25, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon