Freeze Watch
Starts in 15 h 21 min
When
From late tonight through Saturday morning.
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 possible.
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 7:45 AM EDT at KPTW

Sanatoga, PA weather

Sunny and 41°5°.

Forecasts agree

Now 41°5°

Sunny

Wind: Calm; Gusts to 20 mph32 km/h around 10 AM
Dew point: 37°3°; Comfortable · down to 28°−2° by 8 PM (dry)
UV index: 1Low; Moderate 11 AM–4 PM · peak 4
Pressure: 30.32 inHg1027 hPa; Rising · +0.07 inHg+2.4 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 10 AM
High 61°16° today at 3 PM
Below 50°10° tonight after 8 PM
Drops 12°7° tomorrow night 6–9 PM (58°14° → 46°8°)
Below freezing Sunday from 6 AM (low 32°0°)

This morningUp to 53°12° by 11 AM · Clear
This afternoonUp to 61°16° by 3 PM · Clear
TonightDown to 33°1° by 5 AM · Partly cloudy
Tomorrow morningUp to 54°12° by 11 AM · freezing, low 32°0° · Partly cloudy
Tomorrow afternoonUp to 62°17° by 3 PM · Partly cloudy
Tomorrow nightDown to 33°1° 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
Fri 8a	Sunny	40°4° (likely 40°4° to 46°8°)	36°2°	0%	5 mph8 km/h from N, gusts 8 mph12 km/h	82%	0%	0
Fri 9a	Sunny	44°7° (likely 44°7° to 50°10°)	40°4°	0%	5 mph8 km/h from N, gusts 17 mph27 km/h	73%	0%	1
Fri 10a	Sunny	50°10° (likely 50°10° to 53°12°)	46°8°	0%	10 mph16 km/h from NE, gusts 20 mph32 km/h	58%	0%	2
Fri 11a	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	10 mph16 km/h from NE, gusts 19 mph30 km/h	52%	0%	3
Fri 12p	Sunny	56°13° (likely 56°13° to 57°14°)	56°13°	0%	10 mph16 km/h from NE, gusts 16 mph26 km/h	45%	0%	4
Fri 1p	Sunny	58°14° (likely 58°14° to 59°15°)	58°14°	0%	10 mph16 km/h from NE, gusts 14 mph23 km/h	39%	1%	4
Fri 2p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	10 mph16 km/h from NE, gusts 12 mph20 km/h	36%	1%	4
Fri 3p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from NE, gusts 11 mph17 km/h	36%	0%	3
Fri 4p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from NE, gusts 9 mph15 km/h	38%	0%	2
Fri 5p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from NE, gusts 9 mph14 km/h	41%	1%	1
Fri 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	5 mph8 km/h from NE, gusts 8 mph13 km/h	40%	32%	0
Fri 7p	Mostly clear	51°11° (likely 50°10° to 51°11°)	51°11°	0%	5 mph8 km/h from NE, gusts 6 mph9 km/h	46%	40%	0
Fri 8p	Partly cloudy	47°8° (likely 47°8° to 49°9°)	44°7°	0%	5 mph8 km/h from NE, gusts 4 mph7 km/h	47%	48%	0
Fri 9p	Partly cloudy	44°7° (likely 44°7° to 48°9°)	41°5°	0%	5 mph8 km/h from NE, gusts 5 mph7 km/h	49%	62%	0
Fri 10p	Partly cloudy	41°5° (likely 41°5° to 47°8°)	38°3°	0%	5 mph8 km/h from NE, gusts 4 mph6 km/h	52%	58%	0
Fri 11p	Partly cloudy	39°4° (likely 39°4° to 46°8°)	36°2°	0%	5 mph8 km/h from NE, gusts 3 mph6 km/h	57%	57%	0
Sat 12a	Partly cloudy	38°3° (likely 38°3° to 44°7°)	34°1°	0%	5 mph8 km/h from NE, gusts 3 mph5 km/h	59%	45%	0
Sat 1a	Mostly clear	36°2° (likely 36°2° to 43°6°)	32°0°	0%	5 mph8 km/h from NE, gusts 2 mph4 km/h	64%	16%	0
Sat 2a	Clear	35°2° (likely 35°2° to 43°6°)	30°−1°	0%	5 mph8 km/h from NE, gusts 2 mph3 km/h	69%	36%	0
Sat 3a	Clear	34°1° (likely 34°1° to 43°6°)	30°−1°	0%	5 mph8 km/h from NE, gusts 2 mph4 km/h	72%	31%	0
Sat 4a	Clear	34°1° (likely 34°1° to 43°6°)	30°−1°	0%	5 mph8 km/h from NE, gusts 3 mph4 km/h	72%	41%	0
Sat 5a	Mostly clear	33°1° (likely 33°1° to 42°6°)	29°−2°	0%	5 mph8 km/h from N, gusts 3 mph5 km/h	78%	53%	0
Sat 6a	Mostly clear	32°0° (likely 32°0° to 42°6°)	29°−2°	0%	5 mph8 km/h from N, gusts 3 mph5 km/h	78%	53%	0
Sat 7a	Mostly sunny	33°1° (likely 33°1° to 42°6°)	30°−1°	0%	5 mph8 km/h from N, gusts 3 mph6 km/h	75%	54%	0
Sat 8a	Mostly sunny	34°1° (likely 34°1° to 41°5°)	30°−1°	0%	5 mph8 km/h from N, gusts 3 mph6 km/h	78%	69%	0
Sat 9a	Partly sunny	40°4° (likely 40°4° to 45°7°)	37°3°	0%	5 mph8 km/h from NE, gusts 3 mph4 km/h	67%	35%	1
Sat 10a	Partly sunny	49°9° (likely 48°9° to 50°10°)	47°8°	0%	5 mph8 km/h from NE, gusts 3 mph4 km/h	54%	32%	2
Sat 11a	Mostly sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	5 mph8 km/h from NE, gusts 4 mph7 km/h	48%	63%	3
Sat 12p	Mostly sunny	57°14° (likely 55°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	45%	45%	3
Sat 1p	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from S, gusts 5 mph7 km/h	39%	37%	4
Sat 2p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	5 mph8 km/h from S, gusts 4 mph6 km/h	38%	40%	4
Sat 3p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	36%	40%	3
Sat 4p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	38%	25%	2
Sat 5p	Sunny	61°16° (likely 57°14° to 61°16°)	61°16°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	39%	41%	1
Sat 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	5 mph8 km/h from SW, gusts 3 mph6 km/h	42%	41%	0
Sat 7p	Mostly clear	53°12° (likely 51°11° to 53°12°)	53°12°	0%	5 mph8 km/h from SW, gusts 2 mph3 km/h	46%	35%	0
Sat 8p	Clear	46°8° (likely 46°8° to 50°10°)	43°6°	0%	5 mph8 km/h from SW, gusts 1 mph2 km/h	55%	15%	0
Sat 9p	Clear	44°7° (likely 44°7° to 48°9°)	41°5°	0%	5 mph8 km/h from SW, gusts 2 mph3 km/h	57%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 48°9°)	39°4°	0%	5 mph8 km/h from SW, gusts 3 mph4 km/h	62%	0%	0
Sat 11p	Clear	40°4° (likely 40°4° to 47°8°)	38°3°	0%	5 mph8 km/h from SW, gusts 4 mph7 km/h	67%	0%	0
Sun 12a	Clear	38°3° (likely 38°3° to 45°7°)	36°2°	0%	5 mph8 km/h from W, gusts 4 mph6 km/h	76%	0%	0
Sun 1a	Clear	37°3° (likely 37°3° to 44°7°)	34°1°	0%	5 mph8 km/h from W, gusts 3 mph6 km/h	82%	0%	0
Sun 2a	Clear	35°2° (likely 35°2° to 42°6°)	31°−1°	0%	5 mph8 km/h from NW, gusts 3 mph4 km/h	92%	0%	0
Sun 3a	Clear	34°1° (likely 32°0° to 41°5°)	30°−1°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	96%	0%	0
Sun 4a	Clear	33°1° (likely 31°−1° to 40°4°)	29°−2°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	0%	0
Sun 5a	Clear	33°1° (likely 30°−1° to 40°4°)	28°−2°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	0%	0
Sun 6a	Clear	32°0° (likely 30°−1° to 39°4°)	26°−3°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	0%	0
Sun 7a	Sunny	32°0° (likely 29°−2° to 39°4°)	26°−3°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	0%	0

Days ahead

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

Today, Oct 23. Cloudy. High 61°16°, low 31°−1°. Typical 65°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 33°1°
  Dry
Official NWS forecast
Today: Sunny, with a high near 61. Northeast wind 5 to 10 mph, with gusts as high as 25 mph.
Tonight: Areas of frost after 11pm. Partly cloudy, with a low around 31. Northeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
31°−1°–45°7°
Typical high / low
65°18° / 41°5°
Wind
13 mph21 km/h, gusts 24 mph39 km/h
UV peak
4
Tomorrow, Oct 24. Mostly sunny. High 62°17°, low 32°0°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 33°1°
  Dry
Official NWS forecast
Day: Widespread frost before 9am. Sunny, with a high near 62. East wind 0 to 5 mph.
Night: Widespread frost after 11pm. Mostly clear, with a low around 32. West wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–62°17°
Low, likely
32°0°–41°5°
Typical high / low
64°18° / 41°5°
Wind
6 mph10 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 65°18°, low 34°1°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Widespread frost before 9am. Sunny, with a high near 65. Northwest wind around 5 mph.
Night: Mostly clear, with a low around 34.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–65°18°
Low, likely
31°−1°–38°3°
Typical high / low
64°18° / 41°5°
Wind
5 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 44°7°. Typical 64°18° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  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
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69.
Night: Mostly clear, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
32°0°–44°7°
Typical high / low
64°18° / 40°4°
Wind
7 mph11 km/h, gusts 17 mph27 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 65°18°, low 38°3°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 42°6°
  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 38.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
38°3°–48°9°
Typical high / low
63°17° / 40°4°
Wind
9 mph15 km/h, gusts 19 mph30 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 61°16°, low 40°4°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 42°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
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: Mostly cloudy, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
37°3°–45°7°
Typical high / low
63°17° / 40°4°
Wind
8 mph12 km/h, gusts 15 mph25 km/h
UV peak
2
Thursday, Oct 29. Partly sunny. High 66°19°, low 43°6°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 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 66.
Night: Partly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
41°5°–49°9°
Typical high / low
62°17° / 39°4°
Wind
12 mph19 km/h, gusts 30 mph49 km/h
UV peak
3
Friday, Oct 30. Cloudy. High 67°19°, low 48°9°. Typical 62°17° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  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
63°17°–71°22°
Low, likely
46°8°–50°10°
Typical high / low
62°17° / 39°4°
Wind
8 mph14 km/h, gusts 20 mph33 km/h
UV peak
4
Saturday, Oct 31. Sunny. High 60°16°, low 45°7°. Typical 62°17° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  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.
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
53°12°–66°19°
Low, likely
39°4°–53°12°
Typical high / low
62°17° / 39°4°
Wind
9 mph15 km/h, gusts 22 mph36 km/h
UV peak
2
Sunday, Nov 1. Showers. High 61°16°, low 46°8°. Typical 61°16° / 38°3°. Rain 0.59 in15 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°5°
  Dry
2. Afternoon
  noon–6 PM
  Rain, 56°14°
  30% chance · 0.2 in5.1 mm
3. Evening
  6 PM–midnight
  Rain, 51°10°
  30% chance · 0.35 in8.9 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
58°14°–65°18°
Low, likely
35°2°–55°13°
Typical high / low
61°16° / 38°3°
Wind
13 mph21 km/h, gusts 28 mph45 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 31°.
Tomorrow
Dry, high 62°, low 32°.
Sunday
Dry, high 65°, low 34°, 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

Schuylkill River at Pottstown

3.4 mi

Below flood stage

Level: 2.1 ft
Flow: 953 cfs

Forecast peak 2.1 ft Fri 2 PM

Reading from Fri 7:15 AM · NWS gauge page

Perkiomen Creek at Graterford

7.3 mi

Below flood stage

Level: 1.1 ft
Flow: 99 cfs

Forecast peak 1.1 ft Fri 2 PM

Reading from Fri 7:15 AM · NWS gauge page

Schuylkill River at Norristown

16 mi

Below flood stage

Level: 8.1 ft
Flow: 1,360 cfs

Forecast peak 8.1 ft Fri 2 PM

Reading from Fri 7:30 AM · NWS gauge page

Schuylkill River at Reading

19 mi

Below flood stage

Level: 3.5 ft
Flow: 791 cfs

Forecast peak 3.5 ft Fri 2 PM

Reading from Fri 7:15 AM · NWS gauge page

For your home

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

Heating this week

About 59% less heating than a typical week.

This week 38Typical 92

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 27
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 7 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows (air quality forecast not available for part of this window).

Is this typical?

PHOENIXVILLE 1 E · official normals 1991–2020 · records 1893–2026

Oct 23, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

—SatOct 17
—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23

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

Sun & moon

Sun

Daylight: 10 h 49 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 31 min less
Golden hour: 5:33–6:27 PM; Morning 7:04–7:59 AM
Blue hour: 6:27–6:38 PM; Morning 6:54–7:04 AM; first light 6:54 AM

Stars tonight? Poor

Clouds most of the night (about 44% cover).

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:25 AM · rises 4:42 PM
Full moon: Oct 26
New moon: Nov 9

Looking southwest from Sanatoga. The highest point on the skyline is about 5,000 ft, 50 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 Watch

Sanatoga, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Schuylkill River at Pottstown

Perkiomen Creek at Graterford

Schuylkill River at Norristown

Schuylkill River at Reading

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Poor

Moon