Frost Advisory
Starts in 8 h 37 min
When
From midnight tonight 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 34 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 2:55 PM EDT at KPHL

Berwyn, PA weather

Mostly sunny and 61°16°, jacket by 7 PM.

Forecasts agree

Now 61°16°

Mostly sunny

Wind: Calm; Light through 3 AM
Dew point: 33°1°; Dry, static shocks likely
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 48Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.53 inHg1034 hPa; Falling · −0.06 inHg−2.0 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 6 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 61°16° · Clear
TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 4 PM · Clear
Tomorrow nightDown to 41°5° by 4 AM · Clear
Monday morningUp to 58°14° by 11 AM · Clear
Monday afternoonUp to 66°19° by 2 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 3p	Sunny	61°16° (likely 60°16° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	35%	1%	2
Sat 4p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 3 mph5 km/h	33%	1%	1
Sat 5p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 2 mph4 km/h	35%	0%	0
Sat 6p	Clear	58°14° (likely 55°13° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 2 mph3 km/h	39%	0%	0
Sat 7p	Clear	54°12° (likely 51°11° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 2 mph3 km/h	46%	0%	0
Sat 8p	Clear	50°10° (likely 48°9° to 51°11°)	50°10°	0%	0 mph0 km/h, gusts 2 mph3 km/h	56%	0%	0
Sat 9p	Clear	48°9° (likely 46°8° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 3 mph4 km/h	60%	0%	0
Sat 10p	Clear	46°8° (likely 43°6° to 48°9°)	46°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	68%	0%	0
Sat 11p	Clear	44°7° (likely 42°6° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	73%	0%	0
Sun 12a	Clear	43°6° (likely 40°4° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	73%	0%	0
Sun 1a	Clear	42°6° (likely 40°4° to 45°7°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	76%	0%	0
Sun 2a	Clear	41°5° (likely 39°4° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	76%	0%	0
Sun 3a	Clear	39°4° (likely 38°3° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	0%	0
Sun 4a	Clear	39°4° (likely 37°3° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph6 km/h	79%	0%	0
Sun 5a	Clear	38°3° (likely 36°2° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	82%	0%	0
Sun 6a	Clear	37°3° (likely 35°2° to 42°6°)	37°3°	0%	0 mph0 km/h, gusts 3 mph6 km/h	85%	0%	0
Sun 7a	Sunny	37°3° (likely 35°2° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	85%	0%	0
Sun 8a	Sunny	37°3° (likely 35°2° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	85%	0%	0
Sun 9a	Sunny	43°6° (likely 39°4° to 46°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	0%	1
Sun 10a	Sunny	51°11° (likely 50°10° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	59%	0%	2
Sun 11a	Sunny	56°13° (likely 55°13° to 57°14°)	56°13°	0%	0 mph0 km/h, gusts 6 mph10 km/h	49%	2%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	0 mph0 km/h, gusts 8 mph13 km/h	42%	2%	4
Sun 1p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 7 mph12 km/h	38%	2%	4
Sun 2p	Sunny	63°17° (likely 61°16° to 64°18°)	63°17°	0%	0 mph0 km/h, gusts 6 mph9 km/h	36%	3%	4
Sun 3p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	0 mph0 km/h, gusts 7 mph12 km/h	34%	3%	3
Sun 4p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 7 mph11 km/h	33%	2%	2
Sun 5p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 6 mph10 km/h	36%	1%	1
Sun 6p	Clear	60°16° (likely 56°13° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 6 mph9 km/h	42%	0%	0
Sun 7p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	51%	0%	0
Sun 8p	Clear	51°11° (likely 49°9° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 7 mph12 km/h	63%	0%	0
Sun 9p	Clear	49°9° (likely 47°8° to 50°10°)	49°9°	0%	0 mph0 km/h, gusts 8 mph12 km/h	68%	0%	0
Sun 10p	Clear	47°8° (likely 45°7° to 50°10°)	47°8°	0%	0 mph0 km/h, gusts 8 mph12 km/h	74%	0%	0
Sun 11p	Clear	45°7° (likely 44°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 8 mph14 km/h	82%	0%	0
Mon 12a	Clear	44°7° (likely 43°6° to 49°9°)	44°7°	0%	0 mph0 km/h, gusts 8 mph14 km/h	82%	0%	0
Mon 1a	Clear	44°7° (likely 42°6° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 9 mph14 km/h	79%	0%	0
Mon 2a	Clear	43°6° (likely 41°5° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 9 mph14 km/h	79%	0%	0
Mon 3a	Clear	42°6° (likely 40°4° to 47°8°)	42°6°	0%	0 mph0 km/h, gusts 9 mph15 km/h	82%	0%	0
Mon 4a	Clear	41°5° (likely 40°4° to 46°8°)	39°4°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	85%	0%	0
Mon 5a	Clear	41°5° (likely 39°4° to 46°8°)	39°4°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	85%	0%	0
Mon 6a	Clear	40°4° (likely 37°3° to 45°7°)	38°3°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	89%	9%	0
Mon 7a	Sunny	39°4° (likely 37°3° to 45°7°)	37°3°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	92%	8%	0
Mon 8a	Sunny	41°5° (likely 36°2° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	96%	10%	0
Mon 9a	Sunny	46°8° (likely 41°5° to 50°10°)	44°7°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	86%	16%	1
Mon 10a	Sunny	52°11° (likely 50°10° to 55°13°)	52°11°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	74%	15%	2
Mon 11a	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	64%	6%	3
Mon 12p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	56%	0%	4
Mon 1p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	50%	0%	4
Mon 2p	Sunny	66°19° (likely 65°18° to 67°19°)	66°19°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	47%	2%	4

Days ahead

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

Today, Oct 24. Sunny. High 63°17°, low 37°3°. Typical 65°18° / 48°9°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
2. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 63. Northeast wind around 0 mph.
Tonight: Patchy frost after 10pm. Clear, with a low around 37. Northwest wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–63°17°
Low, likely
32°0°–37°3°
Typical high / low
65°18° / 48°9°
Wind
5 mph9 km/h, gusts 11 mph18 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 66°19°, low 39°4°. Typical 64°18° / 48°9°. 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, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 66. Northwest wind around 0 mph.
Night: Clear, with a low around 39. West wind 0 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–66°19°
Low, likely
34°1°–41°5°
Typical high / low
64°18° / 48°9°
Wind
7 mph11 km/h, gusts 12 mph19 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 47°8°. Typical 64°18° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 68. West wind around 5 mph.
Night: Clear, with a low around 47.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
36°2°–47°8°
Typical high / low
64°18° / 47°8°
Wind
7 mph12 km/h, gusts 18 mph28 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 63°17°, low 40°4°. Typical 64°18° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 63.
Night: Mostly clear, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
40°4°–49°9°
Typical high / low
64°18° / 47°8°
Wind
9 mph14 km/h, gusts 22 mph36 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 62°17°, low 44°7°. Typical 63°17° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°5°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: Mostly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
36°2°–44°7°
Typical high / low
63°17° / 47°8°
Wind
6 mph10 km/h, gusts 15 mph23 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 67°19°, low 49°9°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°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 67.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
42°6°–49°9°
Typical high / low
63°17° / 46°8°
Wind
9 mph14 km/h, gusts 31 mph50 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 70°21°, low 48°9°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 72°22°
  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 70.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–74°23°
Low, likely
45°7°–51°11°
Typical high / low
63°17° / 46°8°
Wind
8 mph12 km/h, gusts 25 mph40 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 70°21°, low 49°9°. Typical 62°17° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°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, 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
64°18°–74°23°
Low, likely
44°7°–52°11°
Typical high / low
62°17° / 46°8°
Wind
7 mph12 km/h, gusts 26 mph41 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 68°20°, low 53°12°. Typical 62°17° / 46°8°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.08 in1.9 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°–72°22°
Low, likely
53°12°–54°12°
Typical high / low
62°17° / 46°8°
Wind
9 mph15 km/h, gusts 24 mph38 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 71°22°, low 60°16°. Typical 62°17° / 45°7°. Rain 0.25 in6.4 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Showers, 63°17°
  30% chance · 0.08 in2.1 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°22°
  20% chance · 0.08 in1.9 mm
3. Evening
  6 PM–midnight
  Drizzle, 67°19°
  30% chance · 0.03 in0.9 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°–76°24°
Low, likely
57°14°–65°18°
Typical high / low
62°17° / 45°7°
Wind
16 mph26 km/h, gusts 37 mph60 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 37°.
Tomorrow
Dry, high 66°, low 39°, warming up.
Monday
Dry, high 68°, low 47°.
Rest of week
Mostly dry, highs 62–71°.

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 Norristown

7.1 mi

Below flood stage

Level: 8.1 ft
Flow: 1,300 cfs

Forecast peak 8.1 ft Sat 8 PM

Reading from Sat 1:30 PM · NWS gauge page

Perkiomen Creek at Graterford

13 mi

Below flood stage

Level: 1.1 ft
Flow: 94 cfs

Forecast peak 1.1 ft Sat 8 PM

Reading from Sat 1:15 PM · NWS gauge page

Brandywine Creek at Chadds Ford

14 mi

Below flood stage

Level: 1.9 ft
Flow: 207 cfs

Forecast peak 1.9 ft Sat 8 PM

Reading from Sat 1:30 PM · NWS gauge page

Schuylkill River at Philadelphia

14 mi

Below flood stage

Level: 6.0 ft
Flow: 1,030 cfs

Forecast peak 6.0 ft Sat 8 PM

Reading from Sat 1 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 30Typical 68

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

Comfort

Dry air outside (dew point 33°F).

Open the windows?

Today, 4:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Philadelphia Franklin Institute · official normals 1991–2020 · records 1940–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 47 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 28 min less
Golden hour: 5:31–6:26 PM; Morning 7:05–7:59 AM
Blue hour: 6:26–6:36 PM; Morning 6:54–7:05 AM; first light 6:54 AM

Stars tonight? Fair

Clear 6:36 PM–6:55 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:33 AM · rises 5:05 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Berwyn. The highest point on the skyline is about 3,800 ft, 48 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

Berwyn, 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 Norristown

Perkiomen Creek at Graterford

Brandywine Creek at Chadds Ford

Schuylkill River at Philadelphia

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