Lannon Lake Weather Forecast

    • 56
    • 85

    Rain Showers Likely

    • 53
    • 73

    Mostly Sunny

    • 59
    • 78

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

    • 63
    • 83

    Mostly Sunny

    • 65
    • 85

    Slight Chance Thunderstorms

Today 3 Aug Big Stone

Partly sunny with a 20 percent chance of Showers. Highs in the mid 80s. South Winds around 10 Mph, increasing to 15 to 20 Mph.

Tonight 3 Aug Big Stone

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Patchy smoke. Breezy with Lows in the upper 50s. Southwest Winds 15 to 25 Mph, becoming northwest 15 to 20 Mph after midnight. Chance of rain 70 percent.

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Lannon Lake Temperature Statistics

August Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 1 August, 2026

    60.8 °F

  • Average August

    71.2 °F

  • Highest 1 August, 2026

    82.4 °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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