Delaware Canal - Summit Harbor Weather Forecast

    • 60
    • 86

    Rain Showers

    • 52
    • 72

    Partly Sunny

    • 53
    • 73

    Mostly Sunny

    • 56
    • 75

    Mostly Sunny

    • 56
    • 74

    Partly Sunny

    • 57
    • 80

    Partly Sunny

Today 6 Sep New Castle

Partly sunny. A chance of Showers and Thunderstorms in the afternoon. Some Thunderstorms may produce damaging Winds and heavy rainfall in the afternoon. Hot with Highs in the upper 80s. South Winds 5 to 10 Mph, becoming southwest 10 to 15 Mph in the afternoon. Chance of rain 50 percent.

Tonight 6 Sep New Castle

Showers. Thunderstorms Likely, mainly in the evening. Some Thunderstorms may produce damaging Winds and heavy rainfall in the evening. Lows in the lower 60s. Northwest Winds 5 to 10 Mph. Chance of rain 80 percent.

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Delaware Canal - Summit Harbor Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 1 September, 2025

    55 °F

  • Average September

    68.8 °F

  • Highest 1 September, 2025

    80.1 °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

    66.5 °F
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