Grand Isle Weather Forecast

    • 58
    • 71

    Chance Rain Showers

    • 58
    • 69

    Rain Showers

    • 61
    • 70

    Rain Showers

    • 63
    • 77

    Partly Sunny

    • 68
    • 86

    Rain Showers Likely

    • 65
    • 83

    Rain Showers Likely

Today 26 Jun Grand Isle

Partly sunny with a slight chance of Showers this Morning, then cloudy with a chance of Showers this afternoon. Highs in the upper 60s. North Winds around 10 Mph. Chance of rain 50 percent.

Tonight 26 Jun Grand Isle

Partly cloudy with a 50 percent chance of Showers. Lows in the upper 50s. North Winds around 10 Mph until Midnight, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grand Isle Temperature Statistics

June Temperature

Plattsburgh International Airport (9.3 miles)

  • Lowest 3 June, 2025

    43 °F

  • Average June

    67.2 °F

  • Highest 23 June, 2025

    100 °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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