Frost Advisory
Starts in 4 h 31 min
When
From 10 PM this evening to 9 AM EDT Sunday.
Where
In Delaware, Kent and New Castle Counties. In Maryland, Caroline, Kent MD, and Queen Annes Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties.
Issued for this forecast zone · National Weather Service Mount Holly NJ
What, impacts and precautionsHide details
What
Temperatures as low as 33 degrees 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: New Castle; Kent; Kent; Queen Anne's; Caroline; Delaware; Philadelphia; Eastern Chester; Eastern Montgomery; Lower Bucks
See it on weather.gov (opens in a new tab)

Observed 4:55 PM EDT at KPHL

Lansdowne, PA weather

Mostly sunny and 63°17°, jacket by 7 PM.

Mostly agree

Now 63°17°

Mostly sunny

Wind: 3 mph5 km/h; From the southeast. Light through 5 AM
Dew point: 33°1°; Dry, static shocks likely
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 55Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.52 inHg1034 hPa; Falling slowly · −0.03 inHg−1.1 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 9 PM
Low 37°3° tomorrow at 7 AM
Above 50°10° tomorrow by 10 AM
High 66°19° tomorrow at 3 PM

TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 58°14° by 11 AM · Clear
Tomorrow afternoonUp to 66°19° by 3 PM · Clear
Tomorrow nightDown to 42°6° by 3 AM · Clear
Monday morningUp to 60°16° by 11 AM · Clear
Monday afternoonUp to 70°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 5p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 3 mph5 km/h	32%	0%	1
Sat 6p	Clear	60°16° (likely 56°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 3 mph5 km/h	37%	0%	0
Sat 7p	Clear	55°13° (likely 53°12° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 2 mph4 km/h	47%	0%	0
Sat 8p	Clear	50°10° (likely 50°10° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 3 mph5 km/h	56%	0%	0
Sat 9p	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 2 mph4 km/h	63%	0%	0
Sat 10p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	0 mph0 km/h, gusts 3 mph4 km/h	68%	0%	0
Sat 11p	Clear	44°7° (likely 44°7° to 49°9°)	44°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	73%	0%	0
Sun 12a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	76%	0%	0
Sun 1a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	0%	0
Sun 2a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	85%	0%	0
Sun 3a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	85%	0%	0
Sun 4a	Clear	39°4° (likely 38°3° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	82%	0%	0
Sun 5a	Clear	38°3° (likely 37°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	85%	0%	0
Sun 6a	Clear	38°3° (likely 37°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 5 mph9 km/h	85%	0%	0
Sun 7a	Sunny	37°3° (likely 36°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	92%	0%	0
Sun 8a	Sunny	39°4° (likely 37°3° to 40°4°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	85%	0%	0
Sun 9a	Sunny	46°8° (likely 42°6° to 47°8°)	46°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	68%	0%	1
Sun 10a	Sunny	53°12° (likely 51°11° to 55°13°)	53°12°	0%	0 mph0 km/h, gusts 4 mph7 km/h	57%	0%	2
Sun 11a	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	47%	1%	3
Sun 12p	Sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	0 mph0 km/h, gusts 6 mph10 km/h	41%	1%	4
Sun 1p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	0 mph0 km/h, gusts 6 mph9 km/h	38%	1%	4
Sun 2p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	0 mph0 km/h, gusts 6 mph9 km/h	34%	1%	4
Sun 3p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	0 mph0 km/h, gusts 5 mph8 km/h	33%	1%	3
Sun 4p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	0 mph0 km/h, gusts 5 mph8 km/h	33%	1%	2
Sun 5p	Sunny	66°19° (likely 63°17° to 66°19°)	66°19°	0%	0 mph0 km/h, gusts 5 mph9 km/h	34%	2%	1
Sun 6p	Clear	62°17° (likely 59°15° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 6 mph9 km/h	41%	0%	0
Sun 7p	Clear	58°14° (likely 55°13° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 6 mph10 km/h	51%	0%	0
Sun 8p	Clear	52°11° (likely 52°11° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 5 mph9 km/h	66%	0%	0
Sun 9p	Clear	50°10° (likely 49°9° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 6 mph10 km/h	74%	0%	0
Sun 10p	Clear	48°9° (likely 47°8° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 7 mph11 km/h	77%	0%	0
Sun 11p	Clear	47°8° (likely 46°8° to 50°10°)	47°8°	0%	0 mph0 km/h, gusts 6 mph10 km/h	83%	0%	0
Mon 12a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 6 mph10 km/h	89%	0%	0
Mon 1a	Clear	44°7° (likely 43°6° to 47°8°)	44°7°	0%	0 mph0 km/h, gusts 6 mph10 km/h	89%	0%	0
Mon 2a	Clear	44°7° (likely 41°5° to 46°8°)	44°7°	0%	0 mph0 km/h, gusts 7 mph11 km/h	89%	0%	0
Mon 3a	Clear	42°6° (likely 40°4° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 8 mph12 km/h	93%	0%	0
Mon 4a	Clear	42°6° (likely 39°4° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 8 mph13 km/h	93%	0%	0
Mon 5a	Clear	42°6° (likely 39°4° to 45°7°)	40°4°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	93%	0%	0
Mon 6a	Clear	41°5° (likely 38°3° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	96%	6%	0
Mon 7a	Sunny	41°5° (likely 38°3° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 8 mph13 km/h	96%	9%	0
Mon 8a	Mostly sunny	42°6° (likely 39°4° to 44°7°)	40°4°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	96%	20%	0
Mon 9a	Sunny	50°10° (likely 45°7° to 50°10°)	49°9°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	74%	12%	1
Mon 10a	Sunny	56°13° (likely 54°12° to 57°14°)	56°13°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	62%	9%	2
Mon 11a	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	58%	7%	3
Mon 12p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	52%	0%	4
Mon 1p	Sunny	66°19° (likely 66°19° to 67°19°)	66°19°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	45%	0%	4
Mon 2p	Sunny	68°20° (likely 68°20° to 69°21°)	68°20°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	42%	0%	4
Mon 3p	Sunny	70°21° (likely 68°20° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	39%	0%	3
Mon 4p	Sunny	70°21° (likely 68°20° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 14 mph22 km/h	41%	0%	2

Days ahead

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

Today, Oct 24. Sunny. High 65°18°, low 37°3°. Typical 64°18° / 46°8°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 65. South wind around 0 mph.
Tonight: Patchy frost after 10pm. Clear, with a low around 37. Southwest wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
35°2°–39°4°
Typical high / low
64°18° / 46°8°
Wind
6 mph9 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 67°19°, low 41°5°. Typical 64°18° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 39°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, 42°6°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 67. Northwest wind around 0 mph.
Night: Mostly clear, with a low around 41. West wind 0 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–67°19°
Low, likely
36°2°–41°5°
Typical high / low
64°18° / 46°8°
Wind
6 mph10 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 48°9°. Typical 63°17° / 45°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. West wind 0 to 5 mph.
Night: Clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
38°3°–48°9°
Typical high / low
63°17° / 45°7°
Wind
8 mph12 km/h, gusts 18 mph28 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 43°6°. Typical 63°17° / 45°7°. 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, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  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 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–66°19°
Low, likely
43°6°–52°11°
Typical high / low
63°17° / 45°7°
Wind
9 mph15 km/h, gusts 23 mph37 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 65°18°, low 47°8°. Typical 63°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 44°7°
  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 65.
Night: Partly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
39°4°–47°8°
Typical high / low
63°17° / 45°7°
Wind
8 mph13 km/h, gusts 14 mph22 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 70°21°, low 50°10°. Typical 62°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 70.
Night: Mostly clear, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–70°21°
Low, likely
44°7°–50°10°
Typical high / low
62°17° / 44°7°
Wind
9 mph14 km/h, gusts 29 mph47 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 52°11°. Typical 62°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°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 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
72°22°–75°24°
Low, likely
45°7°–53°12°
Typical high / low
62°17° / 44°7°
Wind
7 mph11 km/h, gusts 23 mph37 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 68°20°, low 49°9°. Typical 62°17° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  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
62°17°–74°23°
Low, likely
46°8°–55°13°
Typical high / low
62°17° / 44°7°
Wind
8 mph13 km/h, gusts 24 mph39 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 69°21°, low 53°12°. Typical 61°16° / 43°6°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 69°20°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.18 in4.6 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
66°19°–74°23°
Low, likely
48°9°–57°14°
Typical high / low
61°16° / 43°6°
Wind
10 mph16 km/h, gusts 21 mph34 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 70°21°, low 60°16°. Typical 61°16° / 43°6°. Rain 0.33 in8.4 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 64°18°
  30% chance · 0.12 in2.9 mm
2. Afternoon
  noon–6 PM
  Drizzle, 70°21°
  30% chance · 0.08 in2 mm
3. Evening
  6 PM–midnight
  Drizzle, 67°19°
  20% 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
66°19°–77°25°
Low, likely
56°13°–67°19°
Typical high / low
61°16° / 43°6°
Wind
17 mph28 km/h, gusts 36 mph58 km/h

10 days15 days30 days

The outlook

Today
Dry, high 65°, low 37°.
Tomorrow
Dry, high 67°, low 41°.
Monday
Dry, high 70°, low 48°, warming up.
Rest of week
Mostly dry, highs 65–74°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (PHI) (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

Schuylkill River at Philadelphia

5.0 mi

Below flood stage

Level: 6.1 ft
Flow: 1,060 cfs

Forecast peak 6.0 ft Sat 8 PM

Reading from Sat 4 PM · NWS gauge page

Schuylkill River near Philadelphia near 30th Street

5.2 mi

Below flood stage

Level: 0.8 ft

Forecast peak 4.7 ft Sun 1 PM

Reading from Sat 4:30 PM · NWS gauge page

Delaware River at USCG Station Washington Street (IN MLLW)

7.1 mi

Below flood stage

Level: 4.1 ft

Forecast peak 7.9 ft Sun 1 PM

Reading from Sat 4:36 PM · NWS gauge page

Schuylkill River at Norristown

12 mi

Below flood stage

Level: 8.1 ft
Flow: 1,270 cfs

Forecast peak 8.1 ft Sat 8 PM

Reading from Sat 4:30 PM · NWS gauge page

For your home

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

Heating this week

About 64% less heating than a typical week.

This week 28Typical 77

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

Comfort

Dry air outside (dew point 34°F).

Open the windows?

Sun, 12:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Philadelphia International Airport · official normals 1991–2020 · records 1873–2026

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°0° colder than normal (daily mean temperature).

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

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

Sun & moon

Sun

Daylight: 10 h 48 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 27 min less
Golden hour: 5:31–6:25 PM; Morning 7:04–7:58 AM
Blue hour: 6:25–6:36 PM; Morning 6:53–7:04 AM; first light 6:53 AM

Stars tonight? Fair

Clear 6:36 PM–6:54 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:32 AM · rises 5:05 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Lansdowne. The highest point on the skyline is about 5,700 ft, 54 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

Lansdowne, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Schuylkill River at Philadelphia

Schuylkill River near Philadelphia near 30th Street

Delaware River at USCG Station Washington Street (IN MLLW)

Schuylkill River at Norristown

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