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City of New Castle, DENew Castle, DE 7-Day Weather Forecast
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New Castle Weather Forecast
New Castle, DE Weather Forecast Date: 400 PM EDT Tue Sep 15 2026
Weather forecast for New Castle, DE
Tonight Lo: 59°F Lo: 15°C |
Tonight... Mostly clear. Lows in the upper 50s. South winds around 5 mph. |
Wed Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Wednesday... Sunny. Highs in the lower 80s. South winds 5 to 10 mph. |
| Thu Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Thursday... Mostly sunny. Hot with highs in the mid 80s. South winds 5 to 10 mph. |
| Fri Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Friday... Mostly sunny. Highs in the lower 80s. |
| Sat Hi: 79°FHi: 26°C Lo: 61°F Lo: 16°C |
Saturday... Mostly sunny. Highs in the upper 70s. |
Sun Hi: 80°FHi: 27°C Lo: 65°F Lo: 18°C |
Sunday... Mostly cloudy in the morning, then becoming partly sunny. A 50% chance of showers. Highs around 80. |
| Mon Hi: 79°FHi: 26°C Lo: 65°F Lo: 18°C |
Monday... Mostly cloudy with a chance of showers. Highs in the upper 70s. Chance of rain 40%. |
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