Lannon Lake Weather Forecast

    • 58
    • 84

    Chance Rain Showers

    • 58
    • 80

    Partly Sunny

    • 53
    • 78

    Mostly Sunny

    • 60
    • 78

    Chance Rain Showers

    • 62
    • 81

    Slight Chance Thunderstorms

    • 59
    • 82

    Partly Sunny

Today 20 Aug Big Stone

Mostly cloudy late this Morning, then becoming partly sunny. A chance of Sprinkles with a slight chance of Thunderstorms late this morning. Highs in the mid 80s. South Winds 5 to 10 Mph, becoming west this afternoon. Chance of rain 20 percent.

Tonight 20 Aug Big Stone

Mostly clear. Lows in the upper 50s. Northwest Winds 5 to 10 Mph.

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Lannon Lake Temperature Statistics

August Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 8 August, 2026

    50 °F

  • Average August

    69.6 °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

    34.7 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.4 °F
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