Lannon Lake Weather Forecast

    • 46
    • 70

    Mostly Sunny

    • 51
    • 68

    Slight Chance Thunderstorms

    • 56
    • 73

    Mostly Cloudy

    • 57
    • 71

    Chance Thunderstorms

    • 53
    • 71

    Slight Chance Rain Showers

    • 51
    • 70

    Slight Chance Rain Showers

Today 15 Sep Big Stone

Mostly sunny. Highs around 70. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 15 Sep Big Stone

Mostly clear. Lows in the mid 40s. North Winds around 5 Mph, becoming northeast after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 10 September, 2026

    46.4 °F

  • Average September

    70.5 °F

  • Highest 3 September, 2026

    89.6 °F

Climate (2021–2026)

Wheaton Municipal Airport (16.8 miles)

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

  • Average Low 2021–2026

    34.8 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.5 °F
Get WillyWeather+ to remove ads