Frost Advisory
Ends in 7 h 15 min
When
From 10 PM this evening to 9 AM EDT Sunday.
Where
In Delaware, Kent and New Castle Counties. In Maryland, Caroline, Kent MD, and Queen Annes Counties. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, and Philadelphia Counties.
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: New Castle; Kent; Kent; Queen Anne's; Caroline; Delaware; Philadelphia; Eastern Chester; Eastern Montgomery; Lower Bucks
See it on weather.gov (opens in a new tab)

Observed 1:30 AM EDT at KILG

Port Penn, DE weather

Clear and 39°4°.

Mostly agree

Now 39°4°

Clear · Feels like 36°2°

Wind: 5 mph7 km/h; From the northwest. Up to 5 mph8 km/h through 1 PM
Dew point: 37°3°; Comfortable
Humidity: 93%; Air 39°4°, dew point 37°3° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 52Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.57 inHg1035 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 38°3° tonight at 5 AM
Above 50°10° today by 10 AM
High 65°18° today at 3 PM
Below 50°10° tonight after 9 PM

TonightNear 39°4° · Clear
This morningUp to 57°14° by 11 AM · Clear
This afternoonUp to 65°18° by 3 PM · Clear
TonightDown to 41°5° by 4 AM · Clear
Tomorrow morningUp to 59°15° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 70°21° by 3 PM · Clear
Tomorrow nightDown to 52°11° by 9 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
Sun 1a	Clear	40°4° (likely 40°4° to 47°8°)	40°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	0%	0
Sun 2a	Clear	39°4° (likely 39°4° to 46°8°)	39°4°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	0%	0
Sun 3a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	2%	0
Sun 4a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	1%	0
Sun 5a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	1%	0
Sun 6a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	0%	0
Sun 7a	Sunny	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	0%	0
Sun 8a	Sunny	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	96%	3%	0
Sun 9a	Sunny	47°8° (likely 45°7° to 48°9°)	47°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	76%	2%	1
Sun 10a	Sunny	53°12° (likely 50°10° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 4 mph7 km/h	66%	0%	2
Sun 11a	Sunny	57°14° (likely 53°12° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	57%	0%	3
Sun 12p	Sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	5 mph8 km/h from N, gusts 3 mph5 km/h	47%	0%	4
Sun 1p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 5 mph8 km/h	41%	0%	4
Sun 2p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 4 mph7 km/h	40%	0%	4
Sun 3p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 3 mph5 km/h	38%	0%	3
Sun 4p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 4 mph6 km/h	40%	0%	2
Sun 5p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 4 mph7 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 mph8 km/h	48%	0%	0
Sun 7p	Clear	56°13° (likely 54°12° to 57°14°)	56°13°	0%	0 mph0 km/h, gusts 3 mph6 km/h	59%	0%	0
Sun 8p	Clear	50°10° (likely 50°10° to 55°13°)	50°10°	0%	0 mph0 km/h, gusts 4 mph6 km/h	71%	0%	0
Sun 9p	Clear	47°8° (likely 47°8° to 53°12°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	79%	0%	0
Sun 10p	Clear	46°8° (likely 46°8° to 52°11°)	46°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	83%	0%	0
Sun 11p	Clear	44°7° (likely 44°7° to 50°10°)	44°7°	0%	0 mph0 km/h, gusts 8 mph13 km/h	93%	0%	0
Mon 12a	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	0 mph0 km/h, gusts 9 mph15 km/h	96%	0%	0
Mon 1a	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	0 mph0 km/h, gusts 9 mph15 km/h	96%	0%	0
Mon 2a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 8 mph13 km/h	96%	1%	0
Mon 3a	Clear	42°6° (likely 42°6° to 46°8°)	40°4°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	96%	1%	0
Mon 4a	Clear	41°5° (likely 41°5° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	96%	0%	0
Mon 5a	Clear	41°5° (likely 41°5° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	96%	1%	0
Mon 6a	Clear	41°5° (likely 41°5° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 6 mph9 km/h	96%	4%	0
Mon 7a	Sunny	41°5° (likely 40°4° to 45°7°)	39°4°	0%	5 mph8 km/h from W, gusts 6 mph9 km/h	96%	40%	0
Mon 8a	Sunny	43°6° (likely 42°6° to 45°7°)	41°5°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	93%	40%	0
Mon 9a	Sunny	49°9° (likely 45°7° to 49°9°)	48°9°	0%	5 mph8 km/h from W, gusts 5 mph8 km/h	80%	41%	1
Mon 10a	Sunny	54°12° (likely 50°10° to 55°13°)	54°12°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	69%	37%	2
Mon 11a	Mostly sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	62%	16%	3
Mon 12p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	5 mph8 km/h from W, gusts 11 mph18 km/h	54%	1%	4
Mon 1p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	50%	5%	4
Mon 2p	Sunny	68°20° (likely 65°18° to 68°20°)	68°20°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	47%	0%	4
Mon 3p	Sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 12 mph20 km/h	44%	0%	4
Mon 4p	Sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 13 mph20 km/h	46%	0%	2
Mon 5p	Sunny	68°20° (likely 65°18° to 68°20°)	68°20°	0%	5 mph8 km/h from W, gusts 12 mph19 km/h	49%	0%	1
Mon 6p	Clear	64°18° (likely 60°16° to 64°18°)	64°18°	0%	5 mph8 km/h from W, gusts 9 mph15 km/h	56%	0%	0
Mon 7p	Clear	58°14° (likely 56°13° to 59°15°)	58°14°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	69%	0%	0
Mon 8p	Clear	54°12° (likely 54°12° to 56°13°)	54°12°	0%	5 mph8 km/h from W, gusts 8 mph13 km/h	80%	1%	0
Mon 9p	Clear	52°11° (likely 52°11° to 56°13°)	52°11°	0%	5 mph8 km/h from W, gusts 7 mph12 km/h	86%	0%	0
Mon 10p	Clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	5 mph8 km/h from W, gusts 7 mph10 km/h	86%	0%	0
Mon 11p	Clear	52°11° (likely 52°11° to 54°12°)	52°11°	0%	5 mph8 km/h from W, gusts 6 mph10 km/h	86%	0%	0
Tue 12a	Clear	52°11° (likely 51°11° to 54°12°)	52°11°	0%	5 mph8 km/h from NW, gusts 6 mph9 km/h	86%	0%	0

Days ahead

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

Today, Oct 25. Sunny. High 66°19°, low 38°3°. Typical 64°18° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  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
Today: Patchy frost before 9am. Sunny, with a high near 66. North wind 0 to 5 mph.
Tonight: Patchy frost. Clear, with a low around 38. North wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
38°3°–43°6°
Typical high / low
64°18° / 44°7°
Wind
8 mph13 km/h
UV peak
4
Tomorrow, Oct 26. Sunny. High 70°21°, low 49°9°. Typical 63°17° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 70. West wind around 5 mph.
Night: Clear, with a low around 49. Northwest wind 5 to 10 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–70°21°
Low, likely
40°4°–49°9°
Typical high / low
63°17° / 44°7°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 44°7°. Typical 63°17° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Mostly clear, with a low around 44.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
44°7°–52°11°
Typical high / low
63°17° / 43°6°
Wind
11 mph17 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 65°18°, low 47°8°. Typical 63°17° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Mostly cloudy, with a low around 47.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–65°18°
Low, likely
44°7°–48°9°
Typical high / low
63°17° / 43°6°
Wind
9 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 70°21°, low 50°10°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 68°20°
  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: Mostly sunny, with a high near 70.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
48°9°–51°11°
Typical high / low
62°17° / 42°6°
Wind
9 mph15 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 73°23°, low 52°11°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73.
Night: Mostly clear, with a low around 52.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
50°10°–53°12°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 71°22°, low 52°11°. Typical 62°17° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–71°22°
Low, likely
49°9°–54°12°
Typical high / low
62°17° / 42°6°
Wind
11 mph18 km/h, gusts 19 mph31 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 69°21°, low 54°12°. Typical 61°16° / 42°6°. Rain 0.02 in0.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 62°17°
  30% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.05 in1.3 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°–72°22°
Low, likely
47°8°–57°14°
Typical high / low
61°16° / 42°6°
Wind
12 mph20 km/h, gusts 20 mph31 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 71°22°, low 60°16°. Typical 61°16° / 41°5°. Rain 0.12 in3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 63°17°
  30% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Cloudy, 72°22°
  30% chance
3. Evening
  6 PM–midnight
  Mostly clear, 64°18°
  20% chance · 0.01 in0.3 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  20% chance · 0.06 in1.4 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
68°20°–77°25°
Low, likely
55°13°–67°19°
Typical high / low
61°16° / 41°5°
Wind
20 mph33 km/h, gusts 32 mph52 km/h
UV peak
3
Tuesday, Nov 3. Drizzle. High 72°22°, low 58°14°. Typical 60°16° / 41°5°. Rain 0.11 in2.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  20% chance · 0.07 in1.9 mm
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 65°19°
  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
68°20°–77°25°
Low, likely
57°14°–58°14°
Typical high / low
60°16° / 41°5°
Wind
17 mph27 km/h, gusts 36 mph58 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 66°, low 38°.
Tomorrow
Dry, high 70°, low 49°, warming up.
Tuesday
Dry, high 66°, low 44°, cooling off.
Rest of week
Mostly dry, highs 65–73°.

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

Chesapeake and Delaware Canal at Chesapeake City (IN MLLW)

12 mi

Below flood stage

Level: 3.1 ft

Forecast peak 4.2 ft Sun 11 PM

Reading from Sun 12:36 AM · NWS gauge page

Delaware River at Delaware City (IN MLLW)

4.6 mi

Below flood stage

Level: 5.5 ft

Reading from Sun 12:30 AM · NWS gauge page

Christina River at Coochs Bridge

12 mi

Below flood stage

Level: 4.0 ft
Flow: 8 cfs

Reading from Sun 12:15 AM · NWS gauge page

White Clay Creek near Newark

14 mi

Below flood stage

Level: 5.1 ft
Flow: 43 cfs

Reading from Sun 12:15 AM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 26Typical 86

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 20
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 14 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 37°F).

Open the windows?

Today, 12:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

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

Oct 25, today vs a typical year

Today’s expected high is 2°1° warmer than typical.

Last 7 days vs normal

On average 1° colder than normal (daily mean temperature).

−4°−2°MonOct 19
+1°TueOct 20
±0°WedOct 21
±0°ThuOct 22
−3°−2°FriOct 23
—SatOct 24
—SunOct 25

Port Penn 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 24 min less
Golden hour: 5:31–6:26 PM; Morning 7:06–8:00 AM
Blue hour: 6:26–6:36 PM; Morning 6:55–7:06 AM; first light 6:55 AM

Stars tonight? Fair

Clear 1:45–6:55 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

99% lit · growing

Today: sets 6:44 AM · rises 5:34 PM
Full moon: Oct 26
New moon: Nov 9

Looking southeast from Port Penn. 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

Port Penn, DE weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Tuesday

Rest of week

What changed since yesterday

Radar

Rivers

Chesapeake and Delaware Canal at Chesapeake City (IN MLLW)

Delaware River at Delaware City (IN MLLW)

Christina River at Coochs Bridge

White Clay Creek near Newark

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 25, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon