Delaware River - Port Penn Weather Forecast

    • 73
    • 91

    Mostly Sunny

    • 75
    • 92

    Slight Chance Rain Showers

    • 70
    • 87

    Rain Showers Likely

    • 70
    • 87

    Chance Thunderstorms

    • 70
    • 86

    Slight Chance Thunderstorms

    • 66
    • 84

    Partly Sunny

Today 9 Aug New Castle

Mostly sunny. Hot with Highs in the lower 90s. West Winds around 5 Mph.

Tonight 9 Aug New Castle

Mostly clear. Humid with Lows in the lower 70s. West Winds around 5 Mph in the Evening, becoming light and variable.

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Delaware River - Port Penn Temperature Statistics

August Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 4 August, 2026

    66.7 °F

  • Average August

    80.1 °F

  • Highest 6 August, 2026

    91.9 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    66.7 °F
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