Freeze Warning
Ends in 5 h 22 min
When
From midnight tonight to 9 AM EDT Saturday.
Where
In New Jersey, Morris, Somerset, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Upper Bucks, Western Chester, and Western Montgomery Counties.
Issued for this forecast zone · National Weather Service Mount Holly NJ
What, impacts and precautionsHide details
What
Sub-freezing temperatures as low as 30 degrees expected.
Impacts
Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Morris; Hunterdon; Somerset; Berks; Lehigh; Western Chester; Western Montgomery; Upper Bucks
See it on weather.gov (opens in a new tab)

Observed 3:10 AM EDT at KCDW

Chatham, NJ weather

Freeze Warning. 36°2° and clear now.

Forecasts agree

Now 36°2°

Clear

Wind: Calm; Light through 3 PM
Dew point: 34°1°; Dry, static shocks likely
Humidity: 93%; Air 36°2°, dew point 34°1° · frost likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 59Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.5 inHg1033 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 33°1° today at 6 AM
Above 50°10° today by 11 AM
High 62°17° today at 2 PM
Below 50°10° tonight after 9 PM

TonightNear 34°1° · Clear
This morningUp to 54°12° by 11 AM · Mostly cloudy
This afternoonUp to 62°17° by 2 PM · Partly cloudy
TonightDown to 35°2° by 3 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 3 PM · Clear
Tomorrow nightDown to 41°5° 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	34°1° (likely 34°1° to 41°5°)	34°1°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	96%	9%	0
Sat 4a	Partly cloudy	34°1° (likely 34°1° to 40°4°)	34°1°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	96%	13%	0
Sat 5a	Clear	34°1° (likely 34°1° to 40°4°)	34°1°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	96%	29%	0
Sat 6a	Mostly cloudy	33°1° (likely 33°1° to 40°4°)	33°1°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	100%	54%	0
Sat 7a	Partly sunny	34°1° (likely 34°1° to 39°4°)	34°1°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	96%	65%	0
Sat 8a	Cloudy	35°2° (likely 34°1° to 40°4°)	35°2°	0%	3 mph5 km/h from N, gusts 6 mph10 km/h	89%	76%	0
Sat 9a	Cloudy	41°5° (likely 41°5° to 45°7°)	41°5°	0%	2 mph3 km/h from N, gusts 8 mph12 km/h	76%	77%	1
Sat 10a	Cloudy	49°9° (likely 47°8° to 51°11°)	49°9°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	56%	74%	2
Sat 11a	Cloudy	54°12° (likely 52°11° to 55°13°)	54°12°	0%	2 mph3 km/h from N, gusts 3 mph5 km/h	47%	74%	3
Sat 12p	Partly sunny	58°14° (likely 55°13° to 58°14°)	58°14°	0%	1 mph2 km/h from N, gusts 4 mph6 km/h	40%	54%	3
Sat 1p	Mostly sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	37%	31%	4
Sat 2p	Partly sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	34%	34%	4
Sat 3p	Sunny	62°17° (likely 61°16° to 62°17°)	62°17°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	34%	16%	3
Sat 4p	Sunny	62°17° (likely 61°16° to 62°17°)	62°17°	0%	2 mph3 km/h from SW, gusts 5 mph7 km/h	34%	19%	2
Sat 5p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	3 mph5 km/h from SW, gusts 5 mph8 km/h	35%	7%	1
Sat 6p	Clear	59°15° (likely 54°12° to 59°15°)	59°15°	0%	3 mph5 km/h from SW, gusts 6 mph9 km/h	40%	3%	0
Sat 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	49%	0%	0
Sat 8p	Clear	51°11° (likely 48°9° to 51°11°)	51°11°	0%	2 mph3 km/h from SW, gusts 6 mph10 km/h	61%	0%	0
Sat 9p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from SW, gusts 6 mph9 km/h	76%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	0 mph0 km/h, gusts 5 mph9 km/h	86%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	0%	0
Sun 12a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	92%	0%	0
Sun 1a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	0%	0
Sun 2a	Clear	36°2° (likely 36°2° to 43°6°)	36°2°	0%	1 mph2 km/h from NW, gusts 5 mph9 km/h	100%	0%	0
Sun 3a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	0%	0
Sun 4a	Clear	35°2° (likely 35°2° to 42°6°)	35°2°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	0%	0
Sun 5a	Clear	35°2° (likely 35°2° to 41°5°)	35°2°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	100%	0%	0
Sun 6a	Clear	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	100%	0%	0
Sun 7a	Sunny	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	100%	0%	0
Sun 8a	Sunny	36°2° (likely 36°2° to 40°4°)	36°2°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	100%	0%	0
Sun 9a	Sunny	43°6° (likely 41°5° to 46°8°)	43°6°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	86%	0%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 53°12°)	50°10°	0%	0 mph0 km/h, gusts 6 mph10 km/h	68%	0%	2
Sun 11a	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 6 mph10 km/h	55%	0%	3
Sun 12p	Sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	0 mph0 km/h, gusts 6 mph10 km/h	46%	1%	4
Sun 1p	Sunny	63°17° (likely 62°17° to 65°18°)	63°17°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	39%	0%	4
Sun 2p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from W, gusts 7 mph10 km/h	37%	0%	4
Sun 3p	Sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	35%	0%	3
Sun 4p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	2 mph3 km/h from SW, gusts 8 mph12 km/h	35%	0%	2
Sun 5p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	2 mph3 km/h from SW, gusts 8 mph14 km/h	39%	0%	1
Sun 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	47%	0%	0
Sun 7p	Clear	56°13° (likely 52°11° to 56°13°)	56°13°	0%	1 mph2 km/h from W, gusts 8 mph12 km/h	57%	0%	0
Sun 8p	Clear	51°11° (likely 48°9° to 53°12°)	51°11°	0%	1 mph2 km/h from W, gusts 8 mph12 km/h	71%	0%	0
Sun 9p	Clear	48°9° (likely 44°7° to 55°13°)	48°9°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	80%	0%	0
Sun 10p	Clear	47°8° (likely 41°5° to 53°12°)	47°8°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	83%	0%	0
Sun 11p	Clear	45°7° (likely 40°4° to 52°11°)	45°7°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	86%	0%	0
Mon 12a	Clear	43°6° (likely 39°4° to 51°11°)	43°6°	0%	1 mph2 km/h from W, gusts 6 mph9 km/h	93%	0%	0
Mon 1a	Clear	42°6° (likely 39°4° to 51°11°)	42°6°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	93%	0%	0
Mon 2a	Clear	41°5° (likely 39°4° to 50°10°)	41°5°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	96%	0%	0

Days ahead

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

Today, Oct 24. Cloudy. High 62°17°, low 33°1°. Typical 63°17° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Official NWS forecast
Today: Areas of frost before 10am. Mostly sunny, with a high near 62. Northwest wind around 3 mph.
Tonight: Areas of frost. Partly cloudy, with a low around 33. North wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
61°16°–62°17°
Low, likely
33°1°–39°4°
Typical high / low
63°17° / 46°8°
Wind
6 mph9 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 39°4°. Typical 63°17° / 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  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: Areas of frost before 9am. Sunny. High near 65, with temperatures falling to around 63 in the afternoon. West wind around 2 mph.
Night: Clear, with a low around 39. West wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
36°2°–40°4°
Typical high / low
63°17° / 46°8°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Sunny. High 69°21°, low 46°8°. Typical 62°17° / 45°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69.
Night: Clear, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
69°21°–70°21°
Low, likely
38°3°–46°8°
Typical high / low
62°17° / 45°7°
Wind
8 mph13 km/h, gusts 25 mph40 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 63°17°, low 40°4°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  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 63.
Night: Mostly clear, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–63°17°
Low, likely
40°4°–48°9°
Typical high / low
62°17° / 45°7°
Wind
9 mph14 km/h, gusts 26 mph42 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 60°16°, low 44°7°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 60.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–61°16°
Low, likely
36°2°–44°7°
Typical high / low
62°17° / 45°7°
Wind
7 mph12 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 67°19°, low 49°9°. Typical 61°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  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 67.
Night: Partly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–67°19°
Low, likely
43°6°–49°9°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 33 mph53 km/h
UV peak
4
Friday, Oct 30. Sunny. High 68°20°, low 46°8°. Typical 61°16° / 44°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
66°19°–73°23°
Low, likely
43°6°–49°9°
Typical high / low
61°16° / 44°7°
Wind
9 mph15 km/h, gusts 24 mph39 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 68°20°, low 48°9°. 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°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  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°–73°23°
Low, likely
45°7°–51°11°
Typical high / low
60°16° / 44°7°
Wind
8 mph14 km/h, gusts 25 mph40 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 66°19°, low 50°10°. Typical 60°16° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  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
46°8°–54°12°
Typical high / low
60°16° / 43°6°
Wind
8 mph12 km/h, gusts 20 mph32 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 69°21°, low 56°13°. Typical 60°16° / 43°6°. Rain 0.21 in5.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  20% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  20% chance · 0.09 in2.2 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°–71°22°
Low, likely
54°12°–59°15°
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 62°, low 33°.
Tomorrow
Dry, high 65°, low 39°, warming up.
Monday
Dry, high 69°, low 46°, warming up.
Rest of week
Mostly dry, highs 60–69°.

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

Passaic River at Chatham

1.0 mi

Below flood stage

Level: 3.6 ft
Flow: 62 cfs

Forecast peak 3.6 ft Sat 8 AM

Reading from Sat 1:15 AM · NWS gauge page

Passaic River near Millington

8.6 mi

Below flood stage

Level: 4.8 ft
Flow: 35 cfs

Forecast peak 4.8 ft Sat 8 AM

Reading from Sat 1:30 AM · NWS gauge page

Passaic River at Pine Brook

9.0 mi

Below flood stage

Level: 13.0 ft
Flow: 340 cfs

Forecast peak 12.9 ft Sat 8 AM

Reading from Sat 1:15 AM · NWS gauge page

Green Brook at Seeley Mills

5.3 mi

Below flood stage

Level: 1.8 ft

Reading from Sat 1:55 AM · NWS gauge page

For your home

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

Heating this week

About 59% less heating than a typical week.

This week 33Typical 81

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

Comfort

Dry air outside (dew point 34°F).

Open the windows?

Today, 1:00 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

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

Sun & moon

Sun

Daylight: 10 h 45 min; Losing 2 min 30 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: 6:21–6:31 PM; Morning 6:50–7:01 AM; first light 6:50 AM

Stars tonight? Fair

Mostly clear 3:38–5 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 northwest from Chatham. The highest point on the skyline is about 1,400 ft, 20 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

Freeze Warning

Chatham, NJ weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Passaic River at Chatham

Passaic River near Millington

Passaic River at Pine Brook

Green Brook at Seeley Mills

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