Delaware Canal - Summit Harbor Weather Forecast

    • 70
    • 89

    Chance Thunderstorms

    • 63
    • 84

    Mostly Sunny

    • 64
    • 82

    Mostly Sunny

    • 66
    • 83

    Partly Sunny

    • 71
    • 87

    Mostly Sunny

    • 75
    • 93

    Slight Chance Thunderstorms

Today 20 Jul New Castle

Partly sunny. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Hot with Highs in the upper 80s. Southwest Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 20 Jul New Castle

Partly cloudy. Humid with Lows around 70. West Winds 5 to 10 Mph, becoming north after midnight.

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Delaware Canal - Summit Harbor Temperature Statistics

July Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 5 July, 2025

    61.6 °F

  • Average July

    80.1 °F

  • Highest 8 July, 2025

    94.6 °F

Climate (2020–Present)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2020–2025

    48.2 °F

  • Average 2020–2025

    57.3 °F

  • Average High 2020–2025

    66.5 °F
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