Frost Advisory
Ends in 5 h 18 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 3:10 AM EDT at KEWR

South Amboy, NJ weather

Clear and 45°7°.

Mostly agree

Now 45°7°

Clear · Feels like 41°5°

Wind: 6 mph9 km/h; From the north-northeast. Up to 6 mph9 km/h through 3 PM
Dew point: 30°−1°; Dry · up to 40°4° by 11 AM (comfortable)
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 57Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

6°3° cooler than this time yesterday (52°11° then, 46°8° now)

Good hours for

Low 42°6° today at 6 AM
Above 50°10° today by 10 AM
High 62°17° today at 4 PM

TonightNear 44°7° · Clear
This morningUp to 56°13° by 11 AM · Partly cloudy
This afternoonUp to 62°17° by 4 PM · Clear
TonightDown to 41°5° by 5 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 4 PM · Clear
Tomorrow nightDown to 47°8° by 2 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 3a	Clear	44°7° (likely 38°3° to 44°7°)	42°6°	0%	5 mph8 km/h from N, gusts 6 mph9 km/h	73%	3%	0
Sat 4a	Clear	43°6° (likely 38°3° to 43°6°)	41°5°	0%	5 mph8 km/h from N, gusts 4 mph7 km/h	76%	4%	0
Sat 5a	Partly cloudy	43°6° (likely 37°3° to 43°6°)	40°4°	0%	5 mph8 km/h from N, gusts 5 mph7 km/h	76%	19%	0
Sat 6a	Clear	42°6° (likely 37°3° to 43°6°)	39°4°	0%	5 mph8 km/h from N, gusts 4 mph7 km/h	79%	35%	0
Sat 7a	Sunny	43°6° (likely 36°2° to 43°6°)	40°4°	0%	5 mph8 km/h from N, gusts 4 mph7 km/h	76%	41%	0
Sat 8a	Mostly cloudy	45°7° (likely 37°3° to 45°7°)	43°6°	0%	5 mph8 km/h from N, gusts 5 mph9 km/h	68%	52%	0
Sat 9a	Partly sunny	47°8° (likely 42°6° to 47°8°)	46°8°	0%	5 mph8 km/h from N, gusts 8 mph13 km/h	68%	54%	1
Sat 10a	Partly sunny	53°12° (likely 48°9° to 53°12°)	53°12°	0%	5 mph8 km/h from N, gusts 7 mph11 km/h	57%	47%	2
Sat 11a	Sunny	56°13° (likely 52°11° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 5 mph7 km/h	55%	42%	3
Sat 12p	Sunny	58°14° (likely 55°13° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	49%	39%	4
Sat 1p	Mostly sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 3 mph6 km/h	44%	28%	4
Sat 2p	Mostly sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	0 mph0 km/h, gusts 3 mph5 km/h	41%	28%	4
Sat 3p	Mostly sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	0 mph0 km/h, gusts 3 mph5 km/h	41%	21%	3
Sat 4p	Mostly sunny	62°17° (likely 60°16° to 63°17°)	62°17°	0%	0 mph0 km/h, gusts 3 mph6 km/h	41%	11%	2
Sat 5p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 4 mph6 km/h	41%	7%	1
Sat 6p	Mostly clear	61°16° (likely 55°13° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	44%	17%	0
Sat 7p	Clear	59°15° (likely 51°11° to 59°15°)	59°15°	0%	5 mph8 km/h from S, gusts 3 mph5 km/h	45%	3%	0
Sat 8p	Clear	56°13° (likely 49°9° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	53%	0%	0
Sat 9p	Clear	50°10° (likely 47°8° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 4 mph6 km/h	66%	0%	0
Sat 10p	Clear	48°9° (likely 45°7° to 49°9°)	48°9°	0%	0 mph0 km/h, gusts 8 mph12 km/h	71%	0%	0
Sat 11p	Clear	47°8° (likely 44°7° to 47°8°)	47°8°	0%	0 mph0 km/h, gusts 8 mph12 km/h	74%	0%	0
Sun 12a	Clear	46°8° (likely 43°6° to 46°8°)	46°8°	0%	0 mph0 km/h, gusts 8 mph13 km/h	76%	0%	0
Sun 1a	Clear	44°7° (likely 42°6° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 7 mph12 km/h	82%	0%	0
Sun 2a	Clear	43°6° (likely 41°5° to 44°7°)	43°6°	0%	0 mph0 km/h, gusts 7 mph11 km/h	86%	0%	0
Sun 3a	Clear	42°6° (likely 40°4° to 44°7°)	42°6°	0%	0 mph0 km/h, gusts 5 mph9 km/h	89%	1%	0
Sun 4a	Clear	42°6° (likely 39°4° to 43°6°)	42°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	2%	0
Sun 5a	Clear	41°5° (likely 39°4° to 42°6°)	41°5°	0%	0 mph0 km/h, gusts 5 mph8 km/h	93%	2%	0
Sun 6a	Clear	41°5° (likely 38°3° to 42°6°)	41°5°	0%	0 mph0 km/h, gusts 5 mph9 km/h	89%	2%	0
Sun 7a	Sunny	40°4° (likely 37°3° to 41°5°)	40°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	92%	2%	0
Sun 8a	Sunny	42°6° (likely 38°3° to 42°6°)	42°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	2%	0
Sun 9a	Sunny	46°8° (likely 42°6° to 46°8°)	46°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	83%	1%	1
Sun 10a	Sunny	52°11° (likely 50°10° to 52°11°)	52°11°	0%	0 mph0 km/h, gusts 7 mph12 km/h	69%	0%	2
Sun 11a	Sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 7 mph12 km/h	57%	0%	3
Sun 12p	Sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	0 mph0 km/h, gusts 8 mph12 km/h	49%	1%	4
Sun 1p	Sunny	62°17° (likely 61°16° to 64°18°)	62°17°	0%	0 mph0 km/h, gusts 7 mph11 km/h	44%	0%	4
Sun 2p	Sunny	63°17° (likely 62°17° to 66°19°)	63°17°	0%	0 mph0 km/h, gusts 6 mph10 km/h	41%	1%	4
Sun 3p	Sunny	64°18° (likely 63°17° to 67°19°)	64°18°	0%	0 mph0 km/h, gusts 6 mph10 km/h	40%	1%	3
Sun 4p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	0 mph0 km/h, gusts 7 mph11 km/h	38%	1%	2
Sun 5p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	0 mph0 km/h, gusts 7 mph12 km/h	41%	0%	1
Sun 6p	Clear	61°16° (likely 57°14° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 5 mph9 km/h	48%	0%	0
Sun 7p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	57%	0%	0
Sun 8p	Clear	54°12° (likely 51°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 6 mph10 km/h	64%	0%	0
Sun 9p	Clear	54°12° (likely 48°9° to 57°14°)	54°12°	0%	0 mph0 km/h, gusts 6 mph10 km/h	64%	0%	0
Sun 10p	Clear	52°11° (likely 45°7° to 56°13°)	52°11°	0%	0 mph0 km/h, gusts 6 mph10 km/h	69%	0%	0
Sun 11p	Clear	50°10° (likely 42°6° to 55°13°)	50°10°	0%	0 mph0 km/h, gusts 7 mph11 km/h	74%	0%	0
Mon 12a	Clear	49°9° (likely 40°4° to 54°12°)	49°9°	0%	0 mph0 km/h, gusts 8 mph12 km/h	77%	0%	0
Mon 1a	Clear	48°9° (likely 39°4° to 53°12°)	47°8°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	77%	0%	0
Mon 2a	Clear	47°8° (likely 38°3° to 52°11°)	46°8°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	79%	0%	0

Days ahead

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

Today, Oct 24. Partly sunny. High 62°17°, low 42°6°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 62. Northeast wind 0 to 5 mph.
Tonight: Partly cloudy, with a low around 42. North wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–63°17°
Low, likely
36°2°–42°6°
Typical high / low
63°17° / 46°8°
Wind
6 mph10 km/h, gusts 12 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 44°7°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Official NWS forecast
Day: Sunny, with a high near 65. West wind around 0 mph.
Night: Clear, with a low around 44. West wind 0 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
38°3°–44°7°
Typical high / low
63°17° / 46°8°
Wind
6 mph9 km/h, gusts 12 mph20 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 50°10°. Typical 62°17° / 45°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–69°21°
Low, likely
38°3°–50°10°
Typical high / low
62°17° / 45°7°
Wind
9 mph14 km/h, gusts 19 mph31 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 63°17°, low 45°7°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  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 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–63°17°
Low, likely
45°7°–51°11°
Typical high / low
62°17° / 45°7°
Wind
11 mph18 km/h, gusts 25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 60°16°, low 49°9°. Typical 62°17° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°6°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 52°11°
  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 60.
Night: Mostly cloudy, with a low around 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–60°16°
Low, likely
40°4°–49°9°
Typical high / low
62°17° / 45°7°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 67°19°, low 51°11°. Typical 61°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  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 67.
Night: Partly cloudy, with a low around 51.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–68°20°
Low, likely
44°7°–51°11°
Typical high / low
61°16° / 44°7°
Wind
9 mph14 km/h, gusts 33 mph53 km/h
UV peak
4
Friday, Oct 30. Sunny. High 69°21°, low 49°9°. Typical 61°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
66°19°–73°23°
Low, likely
47°8°–51°11°
Typical high / low
61°16° / 44°7°
Wind
10 mph15 km/h, gusts 22 mph35 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 67°19°, low 49°9°. Typical 60°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 50°10°
  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°–72°22°
Low, likely
44°7°–53°12°
Typical high / low
60°16° / 44°7°
Wind
10 mph15 km/h, gusts 22 mph36 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 66°19°, low 51°11°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  20% 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
60°16°–70°21°
Low, likely
48°9°–55°13°
Typical high / low
60°16° / 43°6°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 70°21°, low 58°14°. Typical 60°16° / 43°6°. Rain 0.19 in4.8 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 60°16°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  20% chance · 0.11 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
55°13°–60°16°
Typical high / low
60°16° / 43°6°
Wind
18 mph29 km/h, gusts 43 mph70 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 42°.
Tomorrow
Dry, high 65°, low 44°, warming up.
Monday
Dry, high 68°, low 50°, warming up.
Rest of week
Mostly dry, highs 60–70°.

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

Arthur Kill at Perth Amboy (IN MLLW)

1.5 mi

Below flood stage

Level: 1.9 ft

Forecast peak 6.5 ft Sat 7 AM

Reading from Sat 2 AM · NWS gauge page

Deep Run at Old Bridge

5.2 mi

Below flood stage

Level: 6.8 ft
Flow: 7 cfs

Reading from Sat 1:15 AM · NWS gauge page

Lawrence Brook at Weston Mills

7.0 mi

Below flood stage

Level: 15.8 ft

Reading from Sat 1:30 AM · NWS gauge page

Raritan Bay at Keansburg (IN MLLW)

7.4 mi

Below flood stage

Level: 2.0 ft

Reading from Sat 2 AM · NWS gauge page

For your home

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

Heating this week

About 68% less heating than a typical week.

This week 26Typical 81

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 18
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 6 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F).

Open the windows?

Today, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Newark Liberty International Airport · official normals 1991–2020 · records 1843–2026

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° colder than normal (daily mean temperature).

−7°−4°SunOct 18
−3°−2°MonOct 19
+2°+1°TueOct 20
+1°WedOct 21
+3°+2°ThuOct 22
—FriOct 23
—SatOct 24

South Amboy weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 29 min less
Golden hour: 5:26–6:21 PM; Morning 7:00–7:55 AM
Blue hour: 6:21–6:31 PM; Morning 6:50–7:00 AM; first light 6:50 AM

Stars tonight? Fair

Mostly clear 3:42–6 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:29 AM · rises 5:00 PM
Full moon: Oct 26
New moon: Nov 9

Looking east from South Amboy. 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

South Amboy, NJ weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Arthur Kill at Perth Amboy (IN MLLW)

Deep Run at Old Bridge

Lawrence Brook at Weston Mills

Raritan Bay at Keansburg (IN MLLW)

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