Frost Advisory
Ends in 3 h 29 min
When
From midnight tonight to 9 AM EDT Saturday.
Where
Portions of central, northern, and southern New Jersey and southeast Pennsylvania.
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: Middlesex; Western Monmouth; Mercer; Salem; Gloucester; Camden; Northwestern Burlington; Ocean; Cumberland; Atlantic; Southeastern Burlington; Delaware; Philadelphia; Eastern Chester; Eastern Montgomery; Lower Bucks
See it on weather.gov (opens in a new tab)

Observed 5:10 AM EDT at KPHL

Marcus Hook, PA weather

Clear and 43°6°.

Forecasts agree

Now 43°6°

Clear

Wind: 5 mph7 km/h; From the north-northwest. Light through 5 PM
Dew point: 36°2°; Comfortable
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 36Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.51 inHg1033 hPa; Rising 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

Low 38°3° today at 6 AM
Above 50°10° today by 10 AM
High 64°18° today at 4 PM

This morningUp to 54°12° by 11 AM · Clear
This afternoonUp to 64°18° by 4 PM · Clear
TonightDown to 43°6° by 3 AM · Clear
Tomorrow morningUp to 58°14° by 11 AM · Clear
Tomorrow afternoonUp to 67°19° by 4 PM · Clear
Tomorrow nightDown to 45°7° by 4 AM · 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 5a	Clear	39°4° (likely 39°4° to 39°4°)	39°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	82%	11%	0
Sat 6a	Clear	38°3° (likely 38°3° to 39°4°)	38°3°	0%	0 mph0 km/h, gusts 6 mph10 km/h	85%	12%	0
Sat 7a	Sunny	38°3° (likely 38°3° to 38°3°)	38°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	85%	14%	0
Sat 8a	Sunny	40°4° (likely 38°3° to 40°4°)	40°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	79%	21%	0
Sat 9a	Sunny	44°7° (likely 42°6° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 6 mph10 km/h	73%	20%	1
Sat 10a	Sunny	50°10° (likely 48°9° to 51°11°)	50°10°	0%	0 mph0 km/h, gusts 6 mph9 km/h	61%	12%	2
Sat 11a	Sunny	54°12° (likely 52°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 5 mph8 km/h	52%	8%	3
Sat 12p	Sunny	57°14° (likely 56°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 4 mph7 km/h	47%	1%	4
Sat 1p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 4 mph7 km/h	41%	0%	4
Sat 2p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 3 mph6 km/h	36%	0%	4
Sat 3p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	0 mph0 km/h, gusts 3 mph4 km/h	36%	0%	3
Sat 4p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 2 mph4 km/h	34%	0%	2
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	61°16° (likely 56°13° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	39%	0%	0
Sat 7p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 4 mph7 km/h	45%	0%	0
Sat 8p	Clear	53°12° (likely 49°9° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	57%	0%	0
Sat 9p	Clear	51°11° (likely 48°9° to 51°11°)	51°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	61%	0%	0
Sat 10p	Clear	49°9° (likely 48°9° to 50°10°)	49°9°	0%	0 mph0 km/h, gusts 3 mph5 km/h	66%	0%	0
Sat 11p	Clear	48°9° (likely 46°8° to 49°9°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	68%	0%	0
Sun 12a	Clear	47°8° (likely 44°7° to 47°8°)	47°8°	0%	0 mph0 km/h, gusts 3 mph5 km/h	71%	0%	0
Sun 1a	Clear	46°8° (likely 43°6° to 46°8°)	46°8°	0%	0 mph0 km/h, gusts 3 mph4 km/h	71%	0%	0
Sun 2a	Clear	46°8° (likely 42°6° to 46°8°)	46°8°	0%	0 mph0 km/h, gusts 3 mph5 km/h	68%	0%	0
Sun 3a	Clear	43°6° (likely 41°5° to 43°6°)	43°6°	0%	0 mph0 km/h, gusts 3 mph5 km/h	76%	0%	0
Sun 4a	Clear	43°6° (likely 40°4° to 43°6°)	43°6°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	0%	0
Sun 5a	Clear	43°6° (likely 39°4° to 43°6°)	43°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	73%	0%	0
Sun 6a	Clear	41°5° (likely 38°3° to 41°5°)	41°5°	0%	0 mph0 km/h, gusts 5 mph8 km/h	79%	6%	0
Sun 7a	Sunny	42°6° (likely 37°3° to 42°6°)	42°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	76%	6%	0
Sun 8a	Sunny	43°6° (likely 38°3° to 43°6°)	43°6°	0%	0 mph0 km/h, gusts 5 mph9 km/h	76%	5%	0
Sun 9a	Sunny	47°8° (likely 43°6° to 47°8°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	0%	1
Sun 10a	Sunny	54°12° (likely 49°9° to 54°12°)	54°12°	0%	0 mph0 km/h, gusts 5 mph7 km/h	57%	0%	2
Sun 11a	Sunny	58°14° (likely 55°13° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 4 mph7 km/h	49%	1%	3
Sun 12p	Sunny	61°16° (likely 58°14° to 62°17°)	61°16°	0%	0 mph0 km/h, gusts 4 mph7 km/h	42%	1%	4
Sun 1p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 3 mph5 km/h	37%	2%	4
Sun 2p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 4 mph7 km/h	35%	1%	4
Sun 3p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	0 mph0 km/h, gusts 4 mph7 km/h	35%	0%	3
Sun 4p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	0 mph0 km/h, gusts 5 mph7 km/h	33%	0%	2
Sun 5p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 5 mph8 km/h	35%	1%	1
Sun 6p	Clear	63°17° (likely 57°14° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 6 mph9 km/h	41%	0%	0
Sun 7p	Clear	59°15° (likely 54°12° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 5 mph8 km/h	49%	0%	0
Sun 8p	Clear	54°12° (likely 51°11° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 5 mph8 km/h	64%	0%	0
Sun 9p	Clear	52°11° (likely 49°9° to 53°12°)	52°11°	0%	0 mph0 km/h, gusts 6 mph10 km/h	66%	0%	0
Sun 10p	Clear	50°10° (likely 48°9° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 5 mph9 km/h	71%	0%	0
Sun 11p	Clear	49°9° (likely 47°8° to 50°10°)	49°9°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	0%	0
Mon 12a	Clear	48°9° (likely 46°8° to 48°9°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	0%	0
Mon 1a	Clear	48°9° (likely 44°7° to 48°9°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	0%	0
Mon 2a	Clear	47°8° (likely 43°6° to 48°9°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	2%	0
Mon 3a	Clear	46°8° (likely 41°5° to 50°10°)	46°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	73%	0%	0
Mon 4a	Clear	45°7° (likely 41°5° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 4 mph7 km/h	76%	0%	0

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. 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, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Official NWS forecast
Today: Patchy frost before 10am. Sunny, with a high near 65. Northeast wind around 0 mph.
Tonight: Patchy frost. Partly cloudy, with a low around 37. North wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–65°18°
Low, likely
37°3°–39°4°
Typical high / low
64°18° / 46°8°
Wind
5 mph8 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 68°20°, low 42°6°. Typical 64°18° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 68. Northwest wind around 0 mph.
Night: Clear, with a low around 42. West wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–68°20°
Low, likely
37°3°–42°6°
Typical high / low
64°18° / 46°8°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Sunny. High 70°21°, low 51°11°. Typical 63°17° / 45°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  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, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 70.
Night: Clear, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
41°5°–51°11°
Typical high / low
63°17° / 45°7°
Wind
9 mph14 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 65°18°, low 43°6°. Typical 63°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 65.
Night: Mostly clear, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–67°19°
Low, likely
43°6°–50°10°
Typical high / low
63°17° / 45°7°
Wind
10 mph16 km/h, gusts 25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 64°18°, low 47°8°. Typical 63°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 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: Mostly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
42°6°–47°8°
Typical high / low
63°17° / 45°7°
Wind
8 mph12 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 51°11°. Typical 62°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°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 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–69°21°
Low, likely
44°7°–51°11°
Typical high / low
62°17° / 44°7°
Wind
8 mph14 km/h, gusts 27 mph43 km/h
UV peak
4
Friday, Oct 30. Sunny. High 71°22°, low 48°9°. Typical 62°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  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, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 71.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–75°24°
Low, likely
46°8°–49°9°
Typical high / low
62°17° / 44°7°
Wind
11 mph18 km/h, gusts 26 mph41 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 71°22°, low 50°10°. Typical 62°17° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 52°11°
  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°–75°24°
Low, likely
46°8°–52°11°
Typical high / low
62°17° / 44°7°
Wind
11 mph17 km/h, gusts 26 mph41 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 68°20°, low 51°11°. Typical 61°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 57°14°
  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
60°16°–71°22°
Low, likely
48°9°–53°12°
Typical high / low
61°16° / 43°6°
Wind
9 mph15 km/h, gusts 22 mph36 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 70°21°, low 58°14°. Typical 61°16° / 43°6°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 60°15°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 71°22°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 65°18°
  30% chance
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
56°13°–60°16°
Typical high / low
61°16° / 43°6°
Wind
8 mph13 km/h, gusts 21 mph33 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 65°, low 37°.
Tomorrow
Dry, high 68°, low 42°, warming up.
Monday
Dry, high 70°, low 51°.
Rest of week
Mostly dry, highs 64–71°.

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

Brandywine Creek at Wilmington

9.0 mi

Below flood stage

Level: 18.6 ft
Flow: 221 cfs

Forecast peak 18.7 ft Sat 8 AM

Reading from Sat 3:30 AM · NWS gauge page

Brandywine Creek at Chadds Ford

10 mi

Below flood stage

Level: 1.9 ft
Flow: 210 cfs

Forecast peak 1.9 ft Sat 8 AM

Reading from Sat 3:30 AM · NWS gauge page

Delaware River at Marcus Hook (IN MLLW)

0.3 mi

Below flood stage

Level: 3.0 ft

Reading from Sat 4:06 AM · NWS gauge page

Chester Creek near Chester

3.9 mi

Below flood stage

Level: 2.6 ft
Flow: 47 cfs

Reading from Sat 3:15 AM · NWS gauge page

For your home

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

Heating this week

About 67% less heating than a typical week.

This week 25Typical 77

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 17
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 2 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Today, 1:00 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
—FriOct 23
—SatOct 24

Marcus Hook 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: 5:32–6:26 PM; Morning 7:04–7:59 AM
Blue hour: 6:26–6:37 PM; Morning 6:54–7:04 AM; first light 6:54 AM

Stars tonight? Good

Mostly clear 5:31–6:54 AM; moon 96% lit but below the horizon.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:33 AM · rises 5:06 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Marcus Hook. Water in view.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

Marcus Hook, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Brandywine Creek at Wilmington

Brandywine Creek at Chadds Ford

Delaware River at Marcus Hook (IN MLLW)

Chester Creek near Chester

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? Good

Moon