Lannon Lake Weather Forecast

    • 58
    • 81

    Becoming Sunny

    • 61
    • 80

    Mostly Cloudy

    • 63
    • 81

    Chance Thunderstorms

    • 65
    • 84

    Partly Sunny

    • 65
    • 85

    Mostly Sunny

    • 64
    • 84

    Slight Chance Thunderstorms

Today 31 Aug Big Stone

Mostly sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph.

Tonight 31 Aug Big Stone

Mostly clear. Lows in the upper 50s. Southwest Winds around 5 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

    68.9 °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

    54.5 °F
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