New Castle Weather Forecast

    • 27
    • 43

    Snow

    • 18
    • 31

    Snow Likely

    • 21
    • 31

    Partly Sunny

    • 25
    • 33

    Partly Sunny

    • 32
    • 43

    Mostly Cloudy

    • 38
    • 52

    Chance Rain

Today 13 Dec New Castle

Mostly cloudy. Highs in the lower 40s. South Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph this afternoon.

Tonight 13 Dec New Castle

Rain likely with snow in the Evening, then snow with a slight chance of rain after midnight. Snow may be heavy at Times after midnight. Snow accumulation of 2 to 4 Inches. Cold with Lows in the mid 20s. Northwest Winds around 5 Mph. Chance of precipitation near 100 percent.

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New Castle Temperature Statistics

December Temperature

Wilmington, New Castle County Airport (1.9 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 (1.9 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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