Wilmington Weather Forecast

    • 68
    • 87

    Chance Rain Showers

    • 63
    • 81

    Partly Sunny

    • 68
    • 81

    Chance Rain Showers

    • 67
    • 83

    Chance Rain Showers

    • 64
    • 82

    Partly Sunny

    • 69
    • 84

    Mostly Sunny

Today 10 Sep New Castle

Mostly cloudy this Morning, then becoming partly sunny. Hot with Highs in the mid 80s. West Winds 5 to 10 Mph.

Tonight 10 Sep New Castle

Mostly cloudy. A chance of Showers in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Humid with Lows in the upper 60s. Northwest Winds around 5 Mph. Chance of rain 70 percent.

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Wilmington Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (5.6 miles)

  • Lowest 8 September, 2026

    55.9 °F

  • Average September

    76.5 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (5.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    66.7 °F
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