Lannon Lake Weather Forecast

    • 51
    • 76

    Becoming Sunny

    • 63
    • 81

    Sunny

    • 55
    • 85

    Chance Rain Showers

    • 47
    • 70

    Rain Showers Likely

    • 48
    • 63

    Rain Showers Likely

    • 47
    • 64

    Chance Rain Showers

Today 9 Sep Big Stone

Partly sunny. Not as warm with Highs in the mid 70s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 9 Sep Big Stone

Mostly clear. Cooler with Lows in the mid 50s. West Winds 5 to 10 Mph.

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Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 1 September, 2026

    51.8 °F

  • Average September

    72 °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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