Delaware River - Port Penn Weather Forecast

    • 62
    • 80

    Becoming Sunny

    • 60
    • 84

    Mostly Sunny

    • 59
    • 77

    Partly Sunny

    • 60
    • 75

    Partly Sunny

    • 62
    • 77

    Partly Sunny

    • 63
    • 80

    Partly Sunny

Today 18 Sep New Castle

Areas of fog in the morning. Mostly sunny. Warmer with Highs around 80. North Winds around 5 Mph.

Tonight 18 Sep New Castle

Mostly clear. Lows in the lower 60s. West 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 9 September, 2025

    53.1 °F

  • Average September

    70.4 °F

  • Highest 6 September, 2025

    91 °F

Climate (2020–Present)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2020–2025

    48.1 °F

  • Average 2020–2025

    57.3 °F

  • Average High 2020–2025

    66.6 °F
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