New Castle Weather Forecast

    • 70
    • 86

    Mostly Sunny

    • 73
    • 87

    Partly Sunny

    • 73
    • 86

    Mostly Cloudy

    • 71
    • 84

    Rain Showers Likely

    • 70
    • 86

    Chance Rain Showers

    • 73
    • 87

    Chance Rain Showers

Today 31 Jul New Castle

Mostly sunny. Hot with Highs in the mid 80s. West Winds 5 to 10 Mph.

Tonight 31 Jul New Castle

Partly cloudy. Humid with Lows in the upper 60s. South Winds 5 to 10 Mph.

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New Castle Temperature Statistics

July Temperature

Wilmington, New Castle County Airport (1.9 miles)

  • Lowest 20 July, 2026

    58.6 °F

  • Average July

    79 °F

  • Highest 2 July, 2026

    103.6 °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

    57.3 °F

  • Average High 2021–2026

    66.7 °F
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