Middletown Weather Forecast

    • 58
    • 81

    Partly Sunny

    • 58
    • 80

    Partly Sunny

    • 62
    • 83

    Mostly Sunny

    • 71
    • 85

    Partly Sunny

    • 65
    • 87

    Slight Chance Thunderstorms

    • 60
    • 79

    Mostly Sunny

    • 64
    • 81

    Mostly Sunny

Today 6 Sep New Castle

Sunny. Highs around 80. North Winds 5 to 10 Mph.

Tonight 6 Sep New Castle

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

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Middletown Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (16.2 miles)

  • Lowest 1 September, 2026

    71.7 °F

  • Average September

    79.7 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (16.2 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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