New Castle, DE Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for New Castle, DE in one place.
Sunny, with a high near 99. Heat index values as high as 105. West wind 5 to 10 mph.
Local Weather Overview
This forecast page for New Castle, DE is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 8:26 PM EDT.
The active forecast window currently covers Jul 15 to Jul 21, 2026 for New Castle, DE.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 15 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 8:26 PM EDT
- Forecast office
- PHI
- Source
- NOAA / NWS
Daily Outlook
This Week in New Castle
Wednesday looks like the warmest upcoming period in New Castle at 99 degrees F.
Friday Night is the coolest period ahead with temperatures near 72 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 10 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 8:26 PM 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 77. Heat index values as high as 103. Northwest wind 0 to 10 mph.
Mostly sunny, with a high near 96. Northwest wind 0 to 10 mph.
Mostly clear, with a low around 75. Northwest wind around 5 mph.
Mostly sunny, with a high near 93.
A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 2pm, then showers and thunderstorms likely. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Showers and thunderstorms likely before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 72. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Sunny
|
99°F |
5 to 10 mph
W
|
|
Wednesday Night
Jul 15
|
Partly Cloudy
|
77°F |
0 to 10 mph
NW
|
|
Thursday
Jul 16
|
Mostly Sunny
|
96°F |
0 to 10 mph
NW
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
75°F |
5 mph
NW
|
|
Friday
Jul 17
|
Mostly Sunny
|
93°F |
5 mph
N
|
|
Friday Night
Jul 17
|
Partly Cloudy then Chance Showers And Thunderstorms
|
72°F |
5 mph
S
|
|
Saturday
Jul 18
|
Chance Showers And Thunderstorms
|
86°F |
5 to 10 mph
S
|
|
Saturday Night
Jul 18
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
73°F |
5 to 10 mph
SW
|
|
Sunday
Jul 19
|
Chance Showers And Thunderstorms
|
87°F |
5 to 10 mph
W
|
|
Sunday Night
Jul 19
|
Chance Showers And Thunderstorms
|
72°F |
5 to 10 mph
NW
|
|
Monday
Jul 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
5 mph
W
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
73°F |
5 mph
S
|
|
Tuesday
Jul 21
|
Chance Rain Showers
|
88°F |
5 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around New Castle.
