New Castle Weather Forecast

    • 64
    • 84

    Partly Sunny

    • 63
    • 82

    Partly Sunny

    • 63
    • 80

    Mostly Cloudy

    • 64
    • 77

    Chance Rain Showers

    • 64
    • 79

    Chance Rain Showers

    • 65
    • 84

    Mostly Sunny

Today 14 Sep New Castle

Patchy fog in the morning. Sunny. Highs in the lower 80s. Southwest Winds around 5 Mph.

Tonight 14 Sep New Castle

Partly cloudy. Patchy fog after midnight. Lows in the lower 60s. South Winds around 5 Mph, becoming southeast after midnight.

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New Castle Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (1.9 miles)

  • Lowest 9 September, 2025

    53.1 °F

  • Average September

    69.8 °F

  • Highest 6 September, 2025

    91 °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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