Frost Advisory
Ends in 4 h 22 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 4:15 AM EDT at KSMQ

South Plainfield, NJ weather

Clear and 30°−1°.

Mostly agree

Now 30°−1°

Clear · Feels like 27°−3°

Wind: 3 mph5 km/h; From the northwest. Light through 4 PM
Dew point: 30°−1°; Dry, static shocks likely
Humidity: 100%; Air 30°−1°, dew point 30°−1° · frost likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 56Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.02 inHg+0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 36°2° tonight at 5 AM
Above 50°10° today by 11 AM
High 63°17° today at 4 PM
Below 50°10° tonight after 9 PM

TonightNear 37°3° · Clear
This morningUp to 54°12° by 11 AM · Partly cloudy
This afternoonUp to 63°17° by 4 PM · Clear
TonightDown to 38°3° by 3 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 66°19° by 4 PM · Clear
Tomorrow nightDown to 41°5° by 3 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 4a	Clear	37°3° (likely 35°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 5 mph9 km/h	85%	6%	0
Sat 5a	Clear	36°2° (likely 34°1° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 7 mph11 km/h	89%	22%	0
Sat 6a	Clear	36°2° (likely 34°1° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	35%	0
Sat 7a	Mostly cloudy	36°2° (likely 33°1° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	44%	0
Sat 8a	Sunny	37°3° (likely 34°1° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 6 mph10 km/h	85%	41%	0
Sat 9a	Sunny	42°6° (likely 41°5° to 45°7°)	42°6°	0%	0 mph0 km/h, gusts 7 mph12 km/h	76%	40%	1
Sat 10a	Sunny	49°9° (likely 48°9° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 5 mph8 km/h	61%	42%	2
Sat 11a	Sunny	54°12° (likely 52°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 3 mph4 km/h	50%	40%	3
Sat 12p	Sunny	57°14° (likely 55°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	43%	37%	3
Sat 1p	Sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	0 mph0 km/h, gusts 4 mph6 km/h	39%	22%	4
Sat 2p	Sunny	62°17° (likely 59°15° to 63°17°)	62°17°	0%	0 mph0 km/h, gusts 4 mph6 km/h	35%	27%	4
Sat 3p	Mostly sunny	62°17° (likely 60°16° to 63°17°)	62°17°	0%	0 mph0 km/h, gusts 4 mph7 km/h	33%	18%	3
Sat 4p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 4 mph7 km/h	31%	6%	2
Sat 5p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 5 mph8 km/h	33%	2%	1
Sat 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	44%	6%	0
Sat 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	49%	2%	0
Sat 8p	Clear	51°11° (likely 48°9° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	56%	0%	0
Sat 9p	Clear	48°9° (likely 45°7° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	63%	0%	0
Sat 10p	Clear	46°8° (likely 44°7° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	65%	0%	0
Sat 11p	Clear	44°7° (likely 42°6° to 47°8°)	44°7°	0%	0 mph0 km/h, gusts 4 mph7 km/h	68%	0%	0
Sun 12a	Clear	43°6° (likely 41°5° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	70%	0%	0
Sun 1a	Clear	42°6° (likely 40°4° to 43°6°)	42°6°	0%	0 mph0 km/h, gusts 6 mph10 km/h	70%	0%	0
Sun 2a	Clear	40°4° (likely 39°4° to 42°6°)	40°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	76%	0%	0
Sun 3a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	82%	0%	0
Sun 4a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 5a	Clear	38°3° (likely 37°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	89%	0%	0
Sun 7a	Sunny	37°3° (likely 35°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 8a	Sunny	38°3° (likely 35°2° to 39°4°)	38°3°	0%	0 mph0 km/h, gusts 4 mph7 km/h	82%	0%	0
Sun 9a	Sunny	43°6° (likely 40°4° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	76%	1%	1
Sun 10a	Sunny	52°11° (likely 49°9° to 52°11°)	52°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	59%	0%	2
Sun 11a	Sunny	57°14° (likely 55°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	49%	0%	3
Sun 12p	Sunny	61°16° (likely 59°15° to 63°17°)	61°16°	0%	0 mph0 km/h, gusts 6 mph10 km/h	41%	0%	4
Sun 1p	Sunny	64°18° (likely 62°17° to 65°18°)	64°18°	0%	0 mph0 km/h, gusts 6 mph9 km/h	35%	0%	4
Sun 2p	Sunny	65°18° (likely 63°17° to 66°19°)	65°18°	0%	0 mph0 km/h, gusts 5 mph9 km/h	31%	0%	4
Sun 3p	Sunny	65°18° (likely 64°18° to 67°19°)	65°18°	0%	0 mph0 km/h, gusts 5 mph9 km/h	31%	0%	3
Sun 4p	Sunny	66°19° (likely 64°18° to 67°19°)	66°19°	0%	0 mph0 km/h, gusts 6 mph10 km/h	30%	0%	2
Sun 5p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 7 mph11 km/h	34%	0%	1
Sun 6p	Clear	62°17° (likely 56°13° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 6 mph10 km/h	39%	0%	0
Sun 7p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 6 mph9 km/h	49%	0%	0
Sun 8p	Clear	52°11° (likely 48°9° to 52°11°)	52°11°	0%	0 mph0 km/h, gusts 7 mph11 km/h	61%	0%	0
Sun 9p	Clear	50°10° (likely 45°7° to 50°10°)	50°10°	0%	0 mph0 km/h, gusts 6 mph9 km/h	66%	0%	0
Sun 10p	Clear	48°9° (likely 43°6° to 48°9°)	48°9°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	0%	0
Sun 11p	Clear	46°8° (likely 41°5° to 46°8°)	46°8°	0%	0 mph0 km/h, gusts 5 mph9 km/h	73%	0%	0
Mon 12a	Clear	44°7° (likely 40°4° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 6 mph10 km/h	76%	1%	0
Mon 1a	Clear	43°6° (likely 39°4° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 7 mph11 km/h	79%	1%	0
Mon 2a	Clear	42°6° (likely 38°3° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	2%	0
Mon 3a	Clear	41°5° (likely 36°2° to 50°10°)	41°5°	0%	0 mph0 km/h, gusts 7 mph12 km/h	85%	0%	0

Days ahead

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

Today, Oct 24. Partly sunny. High 64°18°, low 34°1°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Patchy frost before 10am. Mostly sunny, with a high near 64. North wind around 0 mph.
Tonight: Patchy frost. Partly cloudy, with a low around 34. North wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
33°1°–39°4°
Typical high / low
63°17° / 46°8°
Wind
6 mph10 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 67°19°, low 38°3°. Typical 63°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  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, 41°5°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 67. West wind around 0 mph.
Night: Clear, with a low around 38. West wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
34°1°–39°4°
Typical high / low
63°17° / 46°8°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Sunny. High 70°21°, low 47°8°. Typical 62°17° / 45°7°. 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, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  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 47.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
36°2°–47°8°
Typical high / low
62°17° / 45°7°
Wind
7 mph12 km/h, gusts 21 mph34 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 62°17°, low 39°4°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 62.
Night: Mostly clear, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
39°4°–50°10°
Typical high / low
62°17° / 45°7°
Wind
9 mph14 km/h, gusts 25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 61°16°, low 43°6°. Typical 62°17° / 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°5°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: Partly cloudy, with a low around 43.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–62°17°
Low, likely
36°2°–43°6°
Typical high / low
62°17° / 45°7°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 48°9°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–68°20°
Low, likely
41°5°–48°9°
Typical high / low
61°16° / 44°7°
Wind
8 mph13 km/h, gusts 31 mph49 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 70°21°, low 47°8°. Typical 61°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  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 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
67°19°–73°23°
Low, likely
43°6°–50°10°
Typical high / low
61°16° / 44°7°
Wind
9 mph14 km/h, gusts 24 mph38 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 68°20°, low 47°8°. Typical 60°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 49°9°
  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
42°6°–53°12°
Typical high / low
60°16° / 44°7°
Wind
9 mph14 km/h, gusts 24 mph38 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 67°19°, low 49°9°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°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°–72°22°
Low, likely
47°8°–51°11°
Typical high / low
60°16° / 43°6°
Wind
6 mph10 km/h, gusts 19 mph30 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 70°21°, low 56°13°. Typical 60°16° / 43°6°. Rain 0.16 in4.1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 59°15°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 62°17°
  20% chance · 0.08 in2.1 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
66°19°–73°23°
Low, likely
55°13°–57°14°
Typical high / low
60°16° / 43°6°
Wind
18 mph29 km/h, gusts 41 mph66 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 64°, low 34°.
Tomorrow
Dry, high 67°, low 38°, warming up.
Monday
Dry, high 70°, low 47°, warming up.
Rest of week
Mostly dry, highs 61–70°.

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

Raritan River at Bound Brook

7.2 mi

Below flood stage

Level: 16.9 ft
Flow: 235 cfs

Forecast peak 16.9 ft Sat 8 AM

Reading from Sat 2:15 AM · NWS gauge page

Raritan River at Manville

8.9 mi

Below flood stage

Level: 4.3 ft
Flow: 365 cfs

Forecast peak 4.2 ft Sat 8 AM

Reading from Sat 2:15 AM · NWS gauge page

Arthur Kill at Perth Amboy (IN MLLW)

9.4 mi

Below flood stage

Level: 3.4 ft

Forecast peak 6.5 ft Sat 7 AM

Reading from Sat 3 AM · NWS gauge page

Green Brook at Plainfield

2.9 mi

Below flood stage

Level: 0.9 ft

Reading from Sat 2:30 AM · NWS gauge page

For your home

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

Heating this week

About 62% less heating than a typical week.

This week 30Typical 81

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

Comfort

Dry air outside (dew point 30°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 2:00 PM–5:00 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 Plainfield weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:26–6:21 PM; Morning 7:01–7:56 AM
Blue hour: 6:21–6:32 PM; Morning 6:50–7:01 AM; first light 6:50 AM

Stars tonight? Fair

Mostly clear 4:38–6 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:29 AM · rises 5:01 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from South Plainfield.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 Plainfield, NJ weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Raritan River at Bound Brook

Raritan River at Manville

Arthur Kill at Perth Amboy (IN MLLW)

Green Brook at Plainfield

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