South Hero Weather Forecast

    • 44
    • 79

    Slight Chance Rain Showers

    • 42
    • 61

    Mostly Sunny

    • 47
    • 69

    Partly Sunny

    • 47
    • 64

    Chance Rain Showers

    • 48
    • 65

    Chance Rain Showers

    • 50
    • 69

    Chance Rain Showers

Today 20 May Grand Isle

Partly sunny. A chance of Showers this morning. Highs in the mid 70s. Southwest Winds 10 to 15 Mph, becoming northwest 15 to 20 Mph this afternoon. Chance of rain 30 percent.

Tonight 20 May Grand Isle

Partly cloudy. Lows in the lower 40s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

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South Hero Temperature Statistics

May Temperature

Plattsburgh International Airport (6.8 miles)

  • Lowest 9 May, 2026

    30 °F

  • Average May

    51.8 °F

  • Highest 17 May, 2026

    80.1 °F

Climate (2021–Present)

Plattsburgh International Airport (6.8 miles)

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    47.4 °F

  • Average High 2021–2026

    55.8 °F
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