Lannon Lake Weather Forecast

    • 52
    • 77

    Increasing Clouds

    • 44
    • 63

    Partly Sunny

    • 49
    • 61

    Partly Sunny

    • 45
    • 65

    Slight Chance Thunderstorms

    • 43
    • 61

    Mostly Sunny

    • 51
    • 62

    Partly Sunny

Today 30 Sep Big Stone

Patchy fog this morning. Partly sunny. Highs in the upper 70s. West Winds around 5 Mph.

Tonight 30 Sep Big Stone

Mostly cloudy. Lows in the lower 50s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 16 September, 2026

    41 °F

  • Average September

    64.3 °F

  • Highest 3 September, 2026

    89.6 °F

Climate (2021–2026)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    34.8 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.4 °F
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