National Weather Service Forecast for: New Castle DE
Issued by: National Weather Service Philadelphia, PA
Updated: 3:18 pm EDT May 26, 2026
 
Tonight

Tonight: A chance of showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers after 5am. Mostly cloudy, with a low around 64. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Mostly Cloudy
then Showers
Likely
 Wednesday

Wednesday: Showers likely, with thunderstorms also possible after 11am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 79. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely and
Patchy Fog
 Wednesday
Night
Wednesday Night: A slight chance of showers before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 20%.
Slight Chance
Showers
 Thursday

Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 78. North wind 5 to 10 mph.
Decreasing
Clouds
 Thursday
Night
Thursday Night: Mostly clear, with a low around 57. North wind 5 to 10 mph.
Mostly Clear

 Friday

Friday: Sunny, with a high near 76.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 59.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 73.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 55.
Partly Cloudy
Lo 64 °F Hi 79 °F Lo 64 °F Hi 78 °F Lo 57 °F Hi 76 °F Lo 59 °F Hi 73 °F Lo 55 °F

 

Tonight
 
 A chance of showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers after 5am. Mostly cloudy, with a low around 64. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
 
 Showers likely, with thunderstorms also possible after 11am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 79. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 A slight chance of showers before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 20%.
Thursday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 78. North wind 5 to 10 mph.
Thursday Night
 
 Mostly clear, with a low around 57. North wind 5 to 10 mph.
Friday
 
 Sunny, with a high near 76.
Friday Night
 
 Mostly clear, with a low around 59.
Saturday
 
 Sunny, with a high near 73.
Saturday Night
 
 Partly cloudy, with a low around 55.
Sunday
 
 Sunny, with a high near 73.
Sunday Night
 
 Partly cloudy, with a low around 56.
Monday
 
 Mostly sunny, with a high near 73.
Monday Night
 
 Partly cloudy, with a low around 56.
Tuesday
 
 Mostly sunny, with a high near 73.

 

Forecast from NOAA-NWS for New Castle DE.