Delaware River - Port Penn Weather Forecast

    • 61
    • 79

    Increasing Clouds

    • 59
    • 78

    Mostly Sunny

    • 64
    • 80

    Partly Sunny

    • 72
    • 84

    Partly Sunny

    • 65
    • 86

    Slight Chance Rain Showers

    • 60
    • 78

    Mostly Sunny

Today 6 Sep New Castle

Sunny. Highs in the upper 70s. Northeast Winds around 5 Mph.

Tonight 6 Sep New Castle

Partly cloudy. Lows around 60. East Winds around 5 Mph.

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Delaware River - Port Penn Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 1 September, 2026

    71.7 °F

  • Average September

    78.9 °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

    66.7 °F
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