New Castle Weather Forecast

    • 51
    • 64

    Rain Showers

    • 44
    • 65

    Mostly Sunny

    • 44
    • 61

    Slight Chance Rain Showers

    • 41
    • 57

    Partly Sunny

    • 46
    • 60

    Mostly Sunny

    • 49
    • 66

    Chance Rain Showers

Today 29 Apr New Castle

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms this afternoon. Highs in the mid 60s. Southeast Winds 10 to 15 Mph. Chance of rain 40 percent.

Tonight 29 Apr New Castle

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Lows around 50. Southeast Winds 10 to 15 Mph, becoming southwest 5 to 10 Mph after midnight. Chance of rain 90 percent.

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New Castle Temperature Statistics

April Temperature

Wilmington, New Castle County Airport (1.9 miles)

  • Lowest 8 April, 2026

    30.7 °F

  • Average April

    60.1 °F

  • Highest 15 April, 2026

    90.6 °F

Climate (2021–Present)

Wilmington, New Castle County Airport (1.9 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    57.3 °F

  • Average High 2021–2026

    66.6 °F
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