Delaware River - Port Penn Weather Forecast

    • 64
    • 80

    Rain Showers Likely

    • 60
    • 72

    Chance Rain Showers

    • 58
    • 66

    Chance Rain Showers

    • 57
    • 66

    Chance Rain Showers

    • 55
    • 66

    Chance Rain Showers

    • 55
    • 67

    Chance Rain Showers

Today 20 Sep New Castle

Mostly cloudy with a chance of Showers. A slight chance of Thunderstorms in the afternoon. Humid with Highs in the lower 80s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

Tonight 20 Sep New Castle

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Humid with Lows in the lower 60s. Southwest Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 70 percent.

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Delaware River - Port Penn Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 15 September, 2026

    52.6 °F

  • Average September

    75 °F

  • Highest 1 September, 2026

    93.7 °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

    57.4 °F

  • Average High 2021–2026

    66.8 °F
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