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New Castle, Delaware 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for New Castle DE
National Weather Service Forecast for: New Castle DE
Issued by: National Weather Service Philadelphia, PA
Updated: 2:57 pm EDT May 18, 2025
 
Tonight

Tonight: Mostly clear, with a low around 56. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Clear

Monday

Monday: Sunny, with a high near 74. Northwest wind 10 to 15 mph.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 50. North wind 5 to 10 mph.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 71. Northwest wind 5 to 10 mph.
Sunny

Tuesday
Night
Tuesday Night: Showers likely after 2am.  Mostly cloudy, with a low around 54. North wind around 5 mph becoming east after midnight.  Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Showers
Likely
Wednesday

Wednesday: Showers.  High near 58. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Showers

Wednesday
Night
Wednesday Night: Showers.  Low around 53. Chance of precipitation is 90%.
Showers

Thursday

Thursday: Showers likely.  Mostly cloudy, with a high near 59. Chance of precipitation is 70%.
Showers
Likely
Thursday
Night
Thursday Night: A chance of showers.  Mostly cloudy, with a low around 51. Chance of precipitation is 40%.
Chance
Showers
Lo 56 °F Hi 74 °F Lo 50 °F Hi 71 °F Lo 54 °F Hi 58 °F Lo 53 °F Hi 59 °F Lo 51 °F

 

Tonight
 
Mostly clear, with a low around 56. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
 
Sunny, with a high near 74. Northwest wind 10 to 15 mph.
Monday Night
 
Mostly clear, with a low around 50. North wind 5 to 10 mph.
Tuesday
 
Sunny, with a high near 71. Northwest wind 5 to 10 mph.
Tuesday Night
 
Showers likely after 2am. Mostly cloudy, with a low around 54. North wind around 5 mph becoming east after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
 
Showers. High near 58. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
 
Showers. Low around 53. Chance of precipitation is 90%.
Thursday
 
Showers likely. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.
Thursday Night
 
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 40%.
Friday
 
A chance of showers. Partly sunny, with a high near 64. Chance of precipitation is 40%.
Friday Night
 
Partly cloudy, with a low around 50.
Saturday
 
Mostly sunny, with a high near 67.
Saturday Night
 
Partly cloudy, with a low around 52.
Sunday
 
Mostly sunny, with a high near 70.

 

Forecast from NOAA-NWS for New Castle DE.

Weather Forecast Discussion
735
FXUS61 KPHI 181904
AFDPHI

Area Forecast Discussion
National Weather Service Mount Holly NJ
304 PM EDT Sun May 18 2025

.SYNOPSIS...
A reinforcing cold front will cross through the area tonight.
High pressure will return for Monday and Tuesday. Another
dynamic weather system will approach the region towards the
middle of the week, bringing another period of unsettled weather
through the end of the week.

&&

.NEAR TERM /THROUGH MONDAY/...
Nice Sunday afternoon is ongoing. The area is in between two cold
fronts, which has resulted in dry, but breezy conditions. A few
sprinkles are possible in the Poconos and far NW New Jersey, but not
much is anticipated with that.

The secondary cold front comes in tonight, though the only impact
will be decreasing dew points and drier air advecting in. Skies are
mostly clear for tonight with low temperatures in the 50s.

A nice day to start the week. Low pressure slowly pulls away through
the Canadian Maritimes, and with a strong area of high pressure over
Hudson Bay, edging down through the Great Lakes and into the Mid-
Atlantic, a tight gradient remains. This will result in gusty winds,
though a bit weaker today. Looking at 25-30 MPH gusts during the
daytime hours as we should mix quite well too. Canadian high
pressure will mainly be in control though, bringing mostly sunny
skies and temperatures generally in the low to mid 70s, which is
right around normal for this time in May.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
Upper level ridging will keep a mostly clear sky and dry conditions
across the region through Tuesday. After a breezy Monday, winds
diminish Monday night and into Tuesday. Daytime highs will be in the
60s and 70s on Tuesday. Lows will be in the 40s and 50s at night.
Increasing clouds expected Tuesday evening and into Tuesday night as
our next system approaches. There will be an upper-level trough
moving into the Great Lakes Wednesday. At the surface, a low
pressure system approaches from the southwest. Due to this low
pressure system moving in, widespread rain enters the region early
Wednesday morning and continues throughout the day. There will be
some heavier rain possible with a signal there for frontogenetic
banding as this rain moves northward allowing for some
enhancement of the precipitation. It will be a noticeably
cooler day Wednesday with highs in the 50s to low 60s.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
Upper-level troughing continues to move into the Northeast and keeps
the weather pattern unsettled through the end of the week as the
upper-level trough closes off into an upper-level low. Meanwhile,
our surface low that is moving northward will fizzle out to the
southeast of the Great Lakes while a new coastal low develops off
the Mid-Atlantic coast. This will be our main feature.

This low will deepen as it moves northeast up into New England on
Thursday. The heaviest rain from this feature will be Wednesday
through Thursday, some isolated embedded thunderstorms are also
possible. We get a break from the widespread rain by Thursday night
as the low departs and a few showers linger. There will still be an
unsettled pattern due to that upper-level low on Friday and
Saturday. Some isolated showers during the day Friday with more
scattered showers Saturday. Below normal temperatures are expected
throughout much of the long term period with a warming trend into
the weekend.

&&

.AVIATION /19Z SUNDAY THROUGH FRIDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Rest of Today (through 00z)...VFR. SCT/BKN ceilings likely in the
afternoon ranging between 4000-7000 feet. West-northwest winds
around 15-20 kt with gusts around 30 kt possible. Moderate-high
confidence.

Tonight...VFR with mostly clear skies. West-northwest winds around
10 kt. Moderate-high confidence.

Monday...VFR. Northwest winds around 10-15 kt with gusts 20-25 kt.
High confidence.

Outlook...

Monday night through Tuesday...VFR. No significant weather expected.

Tuesday night through Thursday...Sub-VFR conditions probable with
rain likely.

Friday...Sub-VFR conditions possible at times with occasional
showers.

&&

.MARINE...
A Small Craft Advisory is in effect through Monday for all marine
zones. Gusts will get near 25 kt at times, mainly during the
daytime. A period of sub-SCA gusts may come overnight, but just kept
it simple and took it all the way through. SCA-level gusts will
mainly be observed over inlets and nearshore areas, with a bit
lesser winds over the open water. Seas 2 to 4 feet.

Outlook...

Monday night through Tuesday night...No marine headlines expected.

Wednesday through Friday...SCA conditions probable due to wind gusts
around 25-30 kts and seas building to 7-9 feet.

Rip Currents...

For today, west-northwest winds will increase to around 15-25
mph with a 7-8 second period and breaking waves around 1-3 feet.
As a result, a MODERATE risk for dangerous rip currents is in
place for Atlantic, Ocean and Cape May Beaches. A LOW risk for
dangerous rip currents is in place for Monmouth and Delaware
Beaches.

For Monday, northwest winds will decrease to around 15-20 mph
with a 7-8 second period and breaking waves around 1-2 feet. A
LOW risk for the development of dangerous rip currents is in
place for all beaches.

For specific beach forecasts, visit weather.gov/beach/phi

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 6 PM EDT Monday for ANZ430-431-
     450>455.

&&

$$

SYNOPSIS...Guzzo/MJL
NEAR TERM...Hoeflich
SHORT TERM...Guzzo
LONG TERM...Guzzo
AVIATION...Guzzo/Hoeflich
MARINE...Guzzo/Hoeflich
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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