New Castle County, DE Weather Forecast
County weather hub
Sunny
Compare major city weather across New Castle County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 89. Southwest wind 5 to 15 mph.
County Weather Overview
This county weather page brings together forecast coverage for New Castle County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in New Castle County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Apr 15 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 8:08 AM EDT
- Forecast office
- PHI
- Source
- NOAA / NWS
Daily Outlook
This Week in New Castle County
Today looks like the warmest upcoming period in New Castle County at 89 degrees F.
Monday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Today at about 5 to 15 mph SW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 8:08 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- PHI
- Radar station
- KDOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 65. Southwest wind 5 to 10 mph.
Mostly sunny, with a high near 88. Southwest wind 5 to 10 mph.
Mostly cloudy, with a low around 66. Southwest wind 5 to 10 mph.
A chance of rain showers after 8am. Partly sunny, with a high near 81. West wind 5 to 10 mph. Chance of precipitation is 30%.
A chance of rain showers before 8pm. Mostly clear, with a low around 57. Chance of precipitation is 30%.
Sunny, with a high near 77.
A chance of rain showers after 8pm. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Rain showers likely. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
A slight chance of rain showers before 8am. Sunny, with a high near 54.
Mostly clear, with a low around 35.
Sunny, with a high near 62.
Mostly clear, with a low around 48.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Apr 15
|
Sunny
|
89°F |
5 to 15 mph
SW
|
|
Tonight
Apr 15
|
Partly Cloudy
|
65°F |
5 to 10 mph
SW
|
|
Thursday
Apr 16
|
Mostly Sunny
|
88°F |
5 to 10 mph
SW
|
|
Thursday Night
Apr 16
|
Mostly Cloudy
|
66°F |
5 to 10 mph
SW
|
|
Friday
Apr 17
|
Chance Rain Showers
|
81°F |
5 to 10 mph
W
|
|
Friday Night
Apr 17
|
Chance Rain Showers then Mostly Clear
|
57°F |
0 to 5 mph
NW
|
|
Saturday
Apr 18
|
Sunny
|
77°F |
0 to 10 mph
E
|
|
Saturday Night
Apr 18
|
Chance Rain Showers
|
54°F |
5 to 10 mph
SE
|
|
Sunday
Apr 19
|
Rain Showers Likely
|
67°F |
5 to 15 mph
SW
|
|
Sunday Night
Apr 19
|
Rain Showers Likely
|
41°F |
10 to 15 mph
NW
|
|
Monday
Apr 20
|
Slight Chance Rain Showers then Sunny
|
54°F |
10 to 15 mph
NW
|
|
Monday Night
Apr 20
|
Mostly Clear
|
35°F |
5 to 15 mph
NW
|
|
Tuesday
Apr 21
|
Sunny
|
62°F |
5 to 10 mph
W
|
|
Tuesday Night
Apr 21
|
Mostly Clear
|
48°F |
5 to 10 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across New Castle County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in New Castle County.
Largest mapped city population in this region: 70,376.
