Lannon Lake Weather Forecast

    • 58
    • 82

    Becoming Sunny

    • 51
    • 76

    Mostly Sunny

    • 62
    • 82

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 50
    • 71

    Chance Rain Showers

    • 48
    • 66

    Chance Rain Showers

Today 8 Sep Big Stone

Partly sunny. Humid with Highs in the lower 80s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 8 Sep Big Stone

Mostly clear. Lows in the upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 1 September, 2026

    51.8 °F

  • Average September

    71.9 °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

    54.5 °F
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