Frost Advisory
Starts in 7 h 3 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 34 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 4:35 PM EDT at KILG

Kennett Square, PA weather

Sunny and 61°16°, jacket by 7 PM.

Forecasts agree

Now 61°16°

Sunny

Wind: 9 mph15 km/h; From the east-northeast. Up to 9 mph15 km/h through 4 AM
Dew point: 36°2°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–4 PM · peak 4
Air quality: 34Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.37 inHg1028 hPa; Rising slowly · +0.02 inHg+0.5 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Below 50°10° tonight after 8 PM
Low 34°1° tomorrow at 6 AM
Above 50°10° tomorrow by 10 AM
High 61°16° tomorrow at 2 PM

This afternoonNear 60°16° · Clear
TonightDown to 35°2° by 4 AM · Partly cloudy
Tomorrow morningUp to 55°13° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 62°17° by 4 PM · Clear
Tomorrow nightDown to 37°3° by 5 AM · Clear
Sunday morningUp to 57°14° by 11 AM · Clear
Sunday afternoonUp to 65°18° by 3 PM · 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 4p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	5 mph8 km/h from NE, gusts 9 mph15 km/h	37%	3%	1
Fri 5p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	5 mph8 km/h from NE, gusts 9 mph15 km/h	39%	2%	0
Fri 6p	Clear	57°14° (likely 55°13° to 57°14°)	57°14°	0%	5 mph8 km/h from NE, gusts 8 mph13 km/h	42%	1%	0
Fri 7p	Clear	51°11° (likely 51°11° to 52°11°)	51°11°	0%	5 mph8 km/h from E, gusts 6 mph9 km/h	52%	0%	0
Fri 8p	Mostly clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 7 mph12 km/h	68%	9%	0
Fri 9p	Partly cloudy	43°6° (likely 43°6° to 48°9°)	43°6°	0%	0 mph0 km/h, gusts 8 mph12 km/h	76%	44%	0
Fri 10p	Partly cloudy	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 7 mph12 km/h	85%	53%	0
Fri 11p	Cloudy	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	89%	62%	0
Sat 12a	Partly cloudy	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	89%	57%	0
Sat 1a	Mostly clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	92%	42%	0
Sat 2a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	9%	0
Sat 3a	Clear	36°2° (likely 36°2° to 41°5°)	36°2°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	10%	0
Sat 4a	Clear	35°2° (likely 35°2° to 40°4°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	7%	0
Sat 5a	Clear	35°2° (likely 35°2° to 39°4°)	35°2°	0%	0 mph0 km/h, gusts 5 mph7 km/h	100%	10%	0
Sat 6a	Mostly clear	34°1° (likely 34°1° to 39°4°)	34°1°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	17%	0
Sat 7a	Sunny	35°2° (likely 35°2° to 38°3°)	35°2°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	29%	0
Sat 8a	Sunny	36°2° (likely 36°2° to 39°4°)	33°1°	0%	5 mph8 km/h from N, gusts 6 mph10 km/h	96%	48%	0
Sat 9a	Sunny	42°6° (likely 42°6° to 44°7°)	40°4°	0%	5 mph8 km/h from N, gusts 7 mph11 km/h	79%	60%	1
Sat 10a	Sunny	51°11° (likely 50°10° to 52°11°)	51°11°	0%	5 mph8 km/h from NE, gusts 6 mph9 km/h	61%	56%	2
Sat 11a	Sunny	55°13° (likely 54°12° to 57°14°)	55°13°	0%	5 mph8 km/h from NE, gusts 7 mph11 km/h	55%	28%	3
Sat 12p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	49%	12%	4
Sat 1p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from E, gusts 5 mph8 km/h	44%	2%	4
Sat 2p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from E, gusts 5 mph8 km/h	41%	1%	4
Sat 3p	Sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	0 mph0 km/h, gusts 5 mph7 km/h	41%	3%	3
Sat 4p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 5 mph7 km/h	39%	3%	2
Sat 5p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	41%	3%	1
Sat 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 4 mph7 km/h	47%	0%	0
Sat 7p	Clear	53°12° (likely 51°11° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 3 mph4 km/h	57%	1%	0
Sat 8p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 2 mph4 km/h	68%	2%	0
Sat 9p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 2 mph4 km/h	79%	1%	0
Sat 10p	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	86%	1%	0
Sat 11p	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 2 mph4 km/h	89%	2%	0
Sun 12a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	93%	2%	0
Sun 1a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 2 mph4 km/h	92%	0%	0
Sun 2a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Sun 3a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	0%	0
Sun 4a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	0%	0
Sun 5a	Clear	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 7a	Sunny	36°2° (likely 36°2° to 39°4°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Sun 8a	Sunny	38°3° (likely 36°2° to 40°4°)	38°3°	0%	0 mph0 km/h, gusts 5 mph7 km/h	100%	0%	0
Sun 9a	Sunny	44°7° (likely 41°5° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	86%	1%	1
Sun 10a	Sunny	51°11° (likely 49°9° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	68%	1%	2
Sun 11a	Sunny	57°14° (likely 55°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	57%	2%	3
Sun 12p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	49%	2%	4
Sun 1p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 4 mph7 km/h	46%	2%	4
Sun 2p	Sunny	63°17° (likely 61°16° to 64°18°)	63°17°	0%	0 mph0 km/h, gusts 5 mph7 km/h	43%	1%	4
Sun 3p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 6 mph9 km/h	40%	0%	3

Days ahead

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

Today, Oct 23. Sunny. High 61°16°, low 34°1°. Typical 64°18° / 44°7°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
2. Evening
  6 PM–midnight
  Partly cloudy, 46°8°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 61. Northeast wind around 5 mph.
Tonight: Patchy frost after 3am. Mostly clear, with a low around 34. Northeast wind 0 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–61°16°
Low, likely
34°1°–44°7°
Typical high / low
64°18° / 44°7°
Wind
12 mph19 km/h, gusts 24 mph38 km/h
UV peak
4
Tomorrow, Oct 24. Sunny. High 62°17°, low 36°2°. Typical 64°18° / 44°7°. Dry. Forecasts 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, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 62. East wind 0 to 5 mph.
Night: Clear, with a low around 36. North wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
36°2°–38°3°
Typical high / low
64°18° / 44°7°
Wind
7 mph10 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 65°18°, low 39°4°. Typical 64°18° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Sunny, with a high near 65. Northwest wind around 0 mph.
Night: Clear, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
36°2°–39°4°
Typical high / low
64°18° / 44°7°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Sunny. High 67°19°, low 47°8°. Typical 63°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°5°
  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, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 67.
Night: Clear, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–68°20°
Low, likely
35°2°–47°8°
Typical high / low
63°17° / 44°7°
Wind
8 mph13 km/h, gusts 17 mph28 km/h
UV peak
4
Tuesday, Oct 27. Partly sunny. High 65°18°, low 43°6°. Typical 63°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 65.
Night: Partly cloudy, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
43°6°–49°9°
Typical high / low
63°17° / 43°6°
Wind
10 mph17 km/h, gusts 24 mph38 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 63°17°, low 47°8°. Typical 63°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 42°5°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 63.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
41°5°–47°8°
Typical high / low
63°17° / 43°6°
Wind
6 mph10 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 67°19°, low 49°9°. Typical 62°17° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 48°9°
  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, 51°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 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–69°21°
Low, likely
45°7°–49°9°
Typical high / low
62°17° / 42°6°
Wind
12 mph19 km/h, gusts 29 mph46 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 69°21°, low 49°9°. Typical 62°17° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°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
65°18°–73°23°
Low, likely
45°7°–52°11°
Typical high / low
62°17° / 42°6°
Wind
9 mph14 km/h, gusts 21 mph33 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 65°18°, low 47°8°. Typical 62°17° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°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
56°13°–70°21°
Low, likely
44°7°–51°11°
Typical high / low
62°17° / 42°6°
Wind
12 mph19 km/h, gusts 24 mph38 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 64°18°, low 47°8°. Typical 61°16° / 42°6°. Rain 0.03 in0.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 61°16°
  20% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Fog, 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
58°14°–69°21°
Low, likely
37°3°–52°11°
Typical high / low
61°16° / 42°6°
Wind
9 mph14 km/h, gusts 29 mph46 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 34°.
Tomorrow
Dry, high 62°, low 36°.
Sunday
Dry, high 65°, low 39°, warming up.
Rest of week
Mostly dry, highs 63–69°.

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

Brandywine Creek at Chadds Ford

6.5 mi

Below flood stage

Level: 1.9 ft
Flow: 214 cfs

Forecast peak 1.9 ft Fri 8 PM

Reading from Fri 3:30 PM · NWS gauge page

Brandywine Creek at Wilmington

8.6 mi

Below flood stage

Level: 18.6 ft
Flow: 229 cfs

Forecast peak 18.7 ft Fri 8 PM

Reading from Fri 3:30 PM · NWS gauge page

Red Clay Creek at Kennett Square

2.1 mi

Below flood stage

Level: 3.1 ft
Flow: 22 cfs

Reading from Fri 3:45 PM · NWS gauge page

Red Clay Creek at Wooddale

6.9 mi

Below flood stage

Level: 2.9 ft
Flow: 33 cfs

Reading from Fri 3:45 PM · NWS gauge page

For your home

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

Heating this week

About 57% less heating than a typical week.

This week 35Typical 82

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

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Sat, 1:00 PM–5:00 PM

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

Is this typical?

Wilmington Airport · official normals 1991–2020 · records 1894–2026

Oct 23, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

On average 3°2° colder than normal (daily mean temperature).

−6°−4°SatOct 17
−6°−3°SunOct 18
−4°−2°MonOct 19
+1°TueOct 20
±0°WedOct 21
±0°ThuOct 22
—FriOct 23

Kennett Square weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:34–6:28 PM; Morning 7:04–7:59 AM
Blue hour: 6:28–6:39 PM; Morning 6:54–7:04 AM; first light 6:54 AM

Stars tonight? Fair

Mostly clear 2–6:55 AM, but the moon is 95% lit and up.

Moon

Waxing gibbous

93% lit · growing

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

Looking west from Kennett Square. The highest point on the skyline is about 4,800 ft, 29 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

Frost Advisory

Kennett Square, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Brandywine Creek at Chadds Ford

Brandywine Creek at Wilmington

Red Clay Creek at Kennett Square

Red Clay Creek at Wooddale

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? Fair

Moon