Delaware City Weather Forecast

    • 73
    • 85

    Chance Thunderstorms

    • 66
    • 81

    Partly Sunny

    • 65
    • 78

    Mostly Sunny

    • 67
    • 78

    Mostly Sunny

    • 68
    • 80

    Partly Sunny

    • 73
    • 81

    Slight Chance Rain Showers

Today 4 Sep New Castle

Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. Hot with Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 4 Sep New Castle

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of Showers. Humid with Lows in the upper 60s. Northwest Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Delaware City Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (6.2 miles)

  • Lowest 1 September, 2026

    71.1 °F

  • Average September

    80 °F

  • Highest 1 September, 2026

    91.9 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (6.2 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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