Grand Isle Weather Forecast

    • 28
    • 33

    Cloudy

    • 35
    • 37

    Chance Rain/Snow

    • 18
    • 41

    Snow

    • 7
    • 21

    Snow

    • 10
    • 19

    Mostly Cloudy

    • 18
    • 29

    Chance Snow Showers

    • 10
    • 27

    Chance Snow Showers

Today 12 Jan Grand Isle

Cloudy with a 20 percent chance of snow Showers. Highs in the lower 30s. South Winds around 10 Mph.

Tonight 12 Jan Grand Isle

Cloudy with a 50 percent chance of snow Showers. Little or no snow accumulation. Lows in the upper 20s. South Winds 10 to 15 Mph.

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Grand Isle Temperature Statistics

January Temperature

Plattsburgh International Airport (9.3 miles)

  • Lowest 2 January, 2026

    -0.9 °F

  • Average January

    21.4 °F

  • Highest 9 January, 2026

    48.9 °F

Climate (2021–Present)

Plattsburgh International Airport (9.3 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    56 °F
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