Grand Isle Weather Forecast

    • 50
    • 77

    Slight Chance Rain Showers

    • 52
    • 71

    Partly Sunny

    • 61
    • 75

    Rain Showers Likely

    • 59
    • 70

    Chance Rain Showers

    • 57
    • 76

    Mostly Sunny

    • 63
    • 81

    Mostly Sunny

    • 65
    • 85

    Partly Sunny

Today 17 Aug Grand Isle

Showers, breezy and not as warm with Highs in the mid 70s. Temperature falling into the lower 60s late. North Winds 20 to 25 Mph. Chance of rain 80 percent.

Tonight 17 Aug Grand Isle

Mostly clear. Lows around 50. North Winds 15 to 20 Mph.

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Grand Isle Temperature Statistics

August Temperature

Plattsburgh International Airport (9.3 miles)

  • Lowest 2 August, 2025

    46 °F

  • Average August

    71.2 °F

  • Highest 12 August, 2025

    91.9 °F

Climate (2020–Present)

Plattsburgh International Airport (9.3 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    47.7 °F

  • Average High 2020–2025

    56.1 °F
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