Grand Isle Weather Forecast

    • 39
    • 62

    Chance Rain Showers

    • 36
    • 53

    Mostly Sunny

    • 44
    • 60

    Mostly Sunny

    • 43
    • 64

    Mostly Sunny

    • 45
    • 65

    Mostly Cloudy

    • 45
    • 61

    Mostly Cloudy

    • 47
    • 62

    Slight Chance Rain Showers

Today 8 Oct Grand Isle

Partly sunny with a 50 percent chance of Showers. Breezy with Highs in the lower 60s. North Winds 15 to 25 Mph.

Tonight 8 Oct Grand Isle

Partly cloudy. A chance of Showers until midnight. Breezy with Lows in the lower 40s. North Winds 20 to 25 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

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Grand Isle Temperature Statistics

October Temperature

Plattsburgh International Airport (9.3 miles)

  • Lowest 2 October, 2025

    35.1 °F

  • Average October

    58.4 °F

  • Highest 5 October, 2025

    81 °F

Climate (2020–Present)

Plattsburgh International Airport (9.3 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    47.8 °F

  • Average High 2020–2025

    56.3 °F
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