Lannon Lake Weather Forecast

    • 59
    • 78

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

    • 56
    • 77

    Mostly Sunny

    • 59
    • 80

    Mostly Sunny

    • 61
    • 79

    Mostly Cloudy

    • 58
    • 76

    Slight Chance Rain Showers

Today 5 Aug Big Stone

Mostly sunny. Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 5 Aug Big Stone

Partly cloudy in the Evening, then clearing. Not as cool with Lows in the upper 50s. South Winds 10 to 15 Mph.

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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

    72 °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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