Delaware River - Port Penn Weather Forecast

    • 74
    • 99

    Severe Tstms

    • 71
    • 91

    Rain Showers

    • 68
    • 82

    Rain Showers

    • 66
    • 83

    Rain Showers Likely

    • 68
    • 84

    Slight Chance Rain Showers

    • 72
    • 89

    Chance Thunderstorms

    • 72
    • 91

    Chance Thunderstorms

Today 4 Jul New Castle

Mostly sunny. A chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce damaging Winds this afternoon. Locally heavy rainfall possible this afternoon. Hot with Highs in the upper 90s. Northwest Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 4 Jul New Castle

Mostly cloudy. Showers with a chance of Thunderstorms this Evening, then a chance of Showers and Thunderstorms after midnight. Some Thunderstorms may be severe with damaging Winds and heavy rainfall this evening. Lows in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 90 percent.

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Delaware River - Port Penn Temperature Statistics

July Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 1 July, 2026

    72.6 °F

  • Average July

    87.2 °F

  • Highest 2 July, 2026

    102.9 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.3 °F

  • Average High 2021–2026

    66.7 °F
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