Indian River - Millsboro Weather Forecast

    • 69
    • 90

    Chance Thunderstorms

    • 63
    • 82

    Partly Sunny

    • 61
    • 78

    Mostly Sunny

    • 59
    • 78

    Mostly Sunny

    • 63
    • 82

    Partly Sunny

    • 70
    • 84

    Partly Sunny

Today 4 Sep Inland Sussex

Sunny, hot with Highs around 90. West Winds 5 to 10 Mph.

Tonight 4 Sep Inland Sussex

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Humid with Lows in the upper 60s. West Winds around 5 Mph. Chance of rain 50 percent.

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Indian River - Millsboro Temperature Statistics

September Temperature

Georgetown - Delaware Coastal Airport (7.5 miles)

  • Lowest 1 September, 2026

    71.7 °F

  • Average September

    78.5 °F

  • Highest 1 September, 2026

    91.7 °F

Climate (2021–2026)

Georgetown - Delaware Coastal Airport (7.5 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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