South Hero Weather Forecast

    • 15
    • 34

    Chance Snow Showers

    • 21
    • 27

    Flurries

    • 21
    • 34

    Flurries

    • 18
    • 27

    Mostly Cloudy

    • 24
    • 32

    Chance Snow Showers

    • 18
    • 36

    Chance Rain/Snow

Today 21 Dec Grand Isle

Partly sunny. A chance of snow Showers in the morning. Breezy with Highs in the mid 30s. West Winds 15 to 25 Mph with Gusts up to 40 Mph. Chance of snow 30 percent.

Tonight 21 Dec Grand Isle

Partly cloudy and breezy. Lows around 16. Northwest Winds 15 to 25 Mph with Gusts up to 35 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Hero Temperature Statistics

December Temperature

Plattsburgh International Airport (6.8 miles)

  • Lowest 9 December, 2025

    -9 °F

  • Average December

    21.9 °F

  • Highest 18 December, 2025

    46.9 °F

Climate (2020–Present)

Plattsburgh International Airport (6.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    38.4 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    56 °F
Get WillyWeather+ to remove ads