New Castle Weather Forecast

    • 60
    • 76

    Mostly Sunny

    • 68
    • 83

    Mostly Sunny

    • 70
    • 86

    Partly Sunny

    • 64
    • 84

    Partly Sunny

    • 65
    • 78

    Mostly Cloudy

    • 68
    • 80

    Chance Rain Showers

    • 66
    • 79

    Chance Rain Showers

Today 15 Sep New Castle

Sunny. Highs in the mid 70s. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 15 Sep New Castle

Mostly clear. Lows in the upper 50s. South Winds around 5 Mph.

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New Castle Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (1.9 miles)

  • Lowest 8 September, 2026

    56.6 °F

  • Average September

    76.4 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (1.9 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    66.8 °F
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