Lannon Lake Weather Forecast

    • 50
    • 70

    Increasing Clouds

    • 49
    • 66

    Partly Sunny

    • 48
    • 65

    Rain Showers

    • 46
    • 66

    Partly Sunny

    • 48
    • 66

    Mostly Cloudy

    • 50
    • 68

    Slight Chance Rain Showers

Today 12 Sep Big Stone

Mostly sunny. Not as warm with Highs in the lower 70s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 12 Sep Big Stone

Mostly cloudy. Lows around 50. Northwest 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

    71.6 °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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