Delaware River - Port Penn Weather Forecast

    • 69
    • 84

    Rain Showers Likely

    • 56
    • 76

    Mostly Sunny

    • 59
    • 76

    Mostly Sunny

    • 63
    • 79

    Mostly Sunny

    • 66
    • 82

    Mostly Sunny

    • 64
    • 83

    Chance Rain Showers

Today 13 Sep New Castle

Patchy fog in the morning. Showers with a slight chance of Thunderstorms in the Morning, then mostly sunny in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Humid with Highs in the mid 80s. Southwest Winds around 5 Mph, becoming northwest around 5 Mph in the afternoon. Chance of rain near 100 percent.

Tonight 13 Sep New Castle

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the upper 60s. West Winds 5 to 10 Mph.

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Delaware River - Port Penn Temperature Statistics

September Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 8 September, 2026

    56.6 °F

  • Average September

    76.8 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    66.8 °F
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