Grantville Weather Forecast

    • 46
    • 81

    Increasing Clouds

    • 34
    • 66

    Mostly Sunny

    • 35
    • 65

    Mostly Sunny

    • 57
    • 77

    Partly Sunny

    • 59
    • 78

    Chance Rain Showers

    • 55
    • 78

    Chance Rain Showers

Today 18 Sep Northern St. Lawrence

Sunny this Morning, then becoming partly sunny. Highs in the lower 80s. Southwest Winds around 10 Mph, becoming west this afternoon.

Tonight 18 Sep Northern St. Lawrence

Partly cloudy. Lows in the mid 40s. Northwest Winds around 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grantville Temperature Statistics

September Temperature

Massena, Massena International-Richards Field (6.2 miles)

  • Lowest 12 September, 2025

    37.9 °F

  • Average September

    60.2 °F

  • Highest 4 September, 2025

    84 °F

Climate (2020–Present)

Massena, Massena International-Richards Field (6.2 miles)

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

  • Average Low 2020–2025

    36.7 °F

  • Average 2020–2025

    46.7 °F

  • Average High 2020–2025

    56.3 °F
Get WillyWeather+ to remove ads