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 75. Northwest wind 0 to 5 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
- May 31 to Jun 5, 2026
- Latest sync
- May 30, 2026 6:46 PM EDT
- Forecast office
- PHI
- Source
- NOAA / NWS
Daily Outlook
This Week in New Castle County
Friday looks like the warmest upcoming period in New Castle County at 87 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 10 mph NE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- May 30, 2026 6:46 PM EDT
- Coverage
- 6 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
Mostly clear, with a low around 55. Southwest wind around 5 mph.
Mostly sunny, with a high near 78. North wind 0 to 5 mph.
Partly cloudy, with a low around 53.
A slight chance of rain showers after 8am. Mostly sunny, with a high near 74.
A slight chance of rain showers before 8pm. Partly cloudy, with a low around 52.
Sunny, with a high near 75.
A slight chance of rain showers after 8pm. Partly cloudy, with a low around 54.
A slight chance of rain showers before 8am. Sunny, with a high near 80.
Mostly clear, with a low around 60.
Sunny, with a high near 87.
Partly cloudy, with a low around 66.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
May 31
|
Sunny
|
75°F |
0 to 5 mph
NW
|
|
Sunday Night
May 31
|
Mostly Clear
|
55°F |
5 mph
SW
|
|
Monday
Jun 1
|
Mostly Sunny
|
78°F |
0 to 5 mph
N
|
|
Monday Night
Jun 1
|
Partly Cloudy
|
53°F |
5 mph
E
|
|
Tuesday
Jun 2
|
Slight Chance Rain Showers
|
74°F |
5 mph
NE
|
|
Tuesday Night
Jun 2
|
Slight Chance Rain Showers then Partly Cloudy
|
52°F |
0 to 5 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
75°F |
5 to 10 mph
NE
|
|
Wednesday Night
Jun 3
|
Slight Chance Rain Showers
|
54°F |
0 to 5 mph
NE
|
|
Thursday
Jun 4
|
Slight Chance Rain Showers then Sunny
|
80°F |
5 mph
N
|
|
Thursday Night
Jun 4
|
Mostly Clear
|
60°F |
5 mph
SW
|
|
Friday
Jun 5
|
Sunny
|
87°F |
5 to 10 mph
W
|
|
Friday Night
Jun 5
|
Partly Cloudy
|
66°F |
5 mph
W
|
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.
