National Weather Service Forecast for: New Castle DE
Issued by: National Weather Service Philadelphia, PA
Updated: 7:39 pm EDT Jul 3, 2025
 
Tonight

Tonight: Isolated showers and thunderstorms before 10pm.  Mostly clear, with a low around 67. Northwest wind 5 to 10 mph.  Chance of precipitation is 20%.
Isolated
T-storms then
Mostly Clear
Independence
Day
Independence Day: Sunny, with a high near 84. Northwest wind 5 to 10 mph.
Sunny

Friday
Night
Friday Night: Mostly clear, with a low around 66. Northwest wind around 5 mph becoming northeast after midnight.
Mostly Clear

Saturday

Saturday: Sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Sunny

Saturday
Night
Saturday Night: Partly cloudy, with a low around 68. South wind around 5 mph.
Partly Cloudy

Sunday

Sunday: Sunny, with a high near 87.
Sunny

Sunday
Night
Sunday Night: Partly cloudy, with a low around 73.
Partly Cloudy

Monday

Monday: A chance of showers and thunderstorms after 2pm.  Partly sunny, with a high near 88. Chance of precipitation is 30%.
Partly Sunny
then Chance
T-storms
Monday
Night
Monday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers after 2am.  Partly cloudy, with a low around 74. Chance of precipitation is 30%.
Chance
T-storms then
Chance
Showers
Lo 67 °F Hi 84 °F Lo 66 °F Hi 87 °F Lo 68 °F Hi 87 °F Lo 73 °F Hi 88 °F Lo 74 °F

 

Tonight
 
Isolated showers and thunderstorms before 10pm. Mostly clear, with a low around 67. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Independence Day
 
Sunny, with a high near 84. Northwest wind 5 to 10 mph.
Friday Night
 
Mostly clear, with a low around 66. Northwest wind around 5 mph becoming northeast after midnight.
Saturday
 
Sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Saturday Night
 
Partly cloudy, with a low around 68. South wind around 5 mph.
Sunday
 
Sunny, with a high near 87.
Sunday Night
 
Partly cloudy, with a low around 73.
Monday
 
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 30%.
Monday Night
 
A chance of showers and thunderstorms before 8pm, then a chance of showers after 2am. Partly cloudy, with a low around 74. Chance of precipitation is 30%.
Tuesday
 
A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 50%.
Tuesday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 40%.
Wednesday
 
A chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
Wednesday Night
 
A chance of showers. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Thursday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 50%.

 

Forecast from NOAA-NWS for New Castle DE.