Delaware Canal - Summit Harbor Weather Forecast

    • 58
    • 76

    Rain Showers Likely

    • 62
    • 85

    Mostly Sunny

    • 64
    • 87

    Chance Thunderstorms

    • 70
    • 86

    Chance Thunderstorms

    • 68
    • 85

    Chance Thunderstorms

    • 67
    • 87

    Slight Chance Thunderstorms

Today 23 Jun New Castle

Mostly cloudy with a slight chance of Thunderstorms. Showers Likely, mainly in the morning. Not as warm. Humid with Highs in the upper 70s. West Winds around 5 Mph, becoming north 10 to 15 Mph in the afternoon. Chance of rain 60 percent.

Tonight 23 Jun New Castle

Mostly cloudy with a chance of Showers in the Evening, then mostly clear after midnight. Lows in the lower 60s. North Winds 10 to 15 Mph. Chance of rain 40 percent.

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Delaware Canal - Summit Harbor Temperature Statistics

June Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 2 June, 2026

    47.6 °F

  • Average June

    74.4 °F

  • Highest 12 June, 2026

    97.6 °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

    57.3 °F

  • Average High 2021–2026

    66.6 °F
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