Delaware River - Fort Delaware State Park Weather Forecast

    • 68
    • 83

    Mostly Sunny

    • 67
    • 80

    Mostly Sunny

    • 69
    • 83

    Partly Sunny

    • 76
    • 86

    Mostly Sunny

    • 79
    • 92

    Slight Chance Thunderstorms

    • 77
    • 91

    Chance Thunderstorms

Today 21 Jul New Castle

Sunny, hot with Highs in the mid 80s. Northwest Winds 5 to 10 Mph.

Tonight 21 Jul New Castle

Clear. Lows in the mid 60s. North Winds around 5 Mph.

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Delaware River - Fort Delaware State Park Temperature Statistics

July Temperature

Wilmington, New Castle County Airport (5.6 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 (5.6 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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