Delaware Canal - Summit Harbor Weather Forecast

    • 61
    • 73

    Rain Showers Likely

    • 62
    • 71

    Rain Showers Likely

    • 61
    • 80

    Slight Chance Rain Showers

    • 60
    • 83

    Mostly Sunny

    • 57
    • 76

    Partly Sunny

    • 57
    • 75

    Partly Sunny

Today 16 Sep New Castle

Mostly cloudy. A slight chance of Showers this Morning, then a chance of Showers with a slight chance of Thunderstorms this afternoon. Highs in the lower 70s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

Tonight 16 Sep New Castle

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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Delaware Canal - Summit Harbor Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 9 September, 2025

    53.1 °F

  • Average September

    70.2 °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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