Nassau Weather Forecast

    • 73
    • 90

    Chance Thunderstorms

    • 69
    • 92

    Rain Showers Likely

    • 63
    • 83

    Mostly Sunny

    • 61
    • 77

    Mostly Sunny

    • 61
    • 79

    Mostly Sunny

    • 64
    • 83

    Partly Sunny

Today 3 Sep Inland Sussex

Mostly sunny. A chance of Showers and Thunderstorms this morning. Locally heavy rainfall possible this morning. Hot with Highs in the lower 90s. South Winds 5 to 10 Mph, becoming west this afternoon. Chance of rain 40 percent.

Tonight 3 Sep Inland Sussex

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. West Winds around 5 Mph. Chance of rain 40 percent.

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Nassau Temperature Statistics

September Temperature

Georgetown - Delaware Coastal Airport (9.9 miles)

  • Lowest 1 September, 2026

    71.1 °F

  • Average September

    81.1 °F

  • Highest 1 September, 2026

    91 °F

Climate (2021–2026)

Georgetown - Delaware Coastal Airport (9.9 miles)

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  • Average Low 2021–2026

    48.9 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    68.3 °F
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