Lannon Lake Weather Forecast

    • 54
    • 86

    Chance Thunderstorms

    • 48
    • 70

    Slight Chance Rain Showers

    • 49
    • 63

    Mostly Cloudy

    • 48
    • 67

    Chance Rain Showers

    • 46
    • 65

    Partly Sunny

    • 49
    • 67

    Mostly Cloudy

Today 11 Sep Big Stone

Partly sunny. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. South Winds 15 to 20 Mph. Chance of rain 30 percent.

Tonight 11 Sep Big Stone

Partly cloudy and not as cool. Near steady temperature in the mid 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 1 September, 2026

    51.8 °F

  • Average September

    72.2 °F

  • Highest 3 September, 2026

    89.6 °F

Climate (2021–2026)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    34.8 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.5 °F
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