National Weather Service Forecast for: New Castle DE
Issued by: National Weather Service Philadelphia, PA
Updated: 9:36 pm EST Dec 16, 2025
 
Overnight

Overnight: Mostly clear, with a low around 24. Southwest wind around 5 mph.
Mostly Clear

 Wednesday

Wednesday: Mostly sunny, with a high near 44. Southwest wind 10 to 15 mph.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 26. West wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Thursday

Thursday: A slight chance of rain after 1pm. Mostly sunny, with a high near 51. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 20%.
Mostly Sunny
then Slight
Chance Rain
 Thursday
Night
Thursday Night: Rain. Low around 45. Breezy, with a south wind 10 to 15 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Breezy
 Friday

Friday: A chance of rain before 1pm. Partly sunny, with a high near 55. Breezy. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.
Chance Rain
and Breezy
 Friday
Night
Friday Night: Mostly clear, with a low around 29.
Mostly Clear

 Saturday

Saturday: Mostly sunny, with a high near 42.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly cloudy, with a low around 35.
Mostly Cloudy
Lo 24 °F Hi 44 °F Lo 26 °F Hi 51 °F Lo 45 °F Hi 55 °F Lo 29 °F Hi 42 °F Lo 35 °F

 

Overnight
 
 Mostly clear, with a low around 24. Southwest wind around 5 mph.
Wednesday
 
 Mostly sunny, with a high near 44. Southwest wind 10 to 15 mph.
Wednesday Night
 
 Partly cloudy, with a low around 26. West wind around 5 mph becoming calm in the evening.
Thursday
 
 A slight chance of rain after 1pm. Mostly sunny, with a high near 51. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
 
 Rain. Low around 45. Breezy, with a south wind 10 to 15 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday
 
 A chance of rain before 1pm. Partly sunny, with a high near 55. Breezy. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
 
 Mostly clear, with a low around 29.
Saturday
 
 Mostly sunny, with a high near 42.
Saturday Night
 
 Mostly cloudy, with a low around 35.
Sunday
 
 Partly sunny, with a high near 49.
Sunday Night
 
 Partly cloudy, with a low around 30.
Monday
 
 Mostly sunny, with a high near 40.
Monday Night
 
 Mostly cloudy, with a low around 29.
Tuesday
 
 Mostly cloudy, with a high near 44.

 

Forecast from NOAA-NWS for New Castle DE.