Lannon Lake Weather Forecast

    • 54
    • 80

    Becoming Sunny

    • 52
    • 80

    Mostly Sunny

    • 63
    • 82

    Rain Showers Likely

    • 65
    • 84

    Chance Thunderstorms

    • 60
    • 84

    Slight Chance Thunderstorms

    • 59
    • 82

    Partly Sunny

Today 26 Aug Big Stone

Mostly sunny. Highs around 80. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 26 Aug Big Stone

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

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  • Temperature Real-Time

Lannon Lake Temperature Statistics

August Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 23 August, 2026

    46.4 °F

  • Average August

    69.2 °F

  • Highest 20 August, 2026

    86 °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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