Lannon Lake Weather Forecast

    • 58
    • 81

    Chance Thunderstorms

    • 53
    • 76

    Chance Rain Showers

    • 55
    • 77

    Mostly Sunny

    • 61
    • 81

    Chance Rain Showers

    • 57
    • 81

    Mostly Sunny

    • 57
    • 78

    Partly Sunny

Today 17 Aug Big Stone

Partly sunny. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs in the lower 80s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 17 Aug Big Stone

Mostly cloudy. A chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Patchy fog. Lows in the upper 50s. West Winds around 5 Mph. Chance of rain 40 percent.

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Lannon Lake Temperature Statistics

August Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 8 August, 2026

    50 °F

  • Average August

    69.7 °F

  • Highest 3 August, 2026

    84.2 °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

    54.4 °F
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