Delaware River - Fort Delaware State Park Weather Forecast

    • 20
    • 33

    Chance Snow

    • 24
    • 30

    Partly Sunny

    • 28
    • 32

    Partly Sunny

    • 33
    • 43

    Partly Sunny

    • 41
    • 55

    Breezy

    • 31
    • 46

    Slight Chance Rain

Today 14 Dec New Castle

Mostly sunny. A chance of snow in the morning. Total snow accumulation of 3 to 5 Inches possible. Colder with Highs in the lower 30s. Temperature falling into the lower 20s in the afternoon. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of snow 50 percent.

Tonight 14 Dec New Castle

Mostly clear. Colder with Lows around 16. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Delaware River - Fort Delaware State Park Temperature Statistics

December Temperature

Wilmington, New Castle County Airport (5.6 miles)

  • Lowest 9 December, 2025

    17.1 °F

  • Average December

    33.9 °F

  • Highest 1 December, 2025

    45 °F

Climate (2020–Present)

Wilmington, New Castle County Airport (5.6 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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