Lannon Lake Weather Forecast

    • 48
    • 65

    Mostly Cloudy

    • 40
    • 63

    Mostly Cloudy

    • 41
    • 65

    Mostly Sunny

    • 48
    • 67

    Chance Rain Showers

    • 51
    • 69

    Mostly Cloudy

    • 54
    • 73

    Mostly Cloudy

Today 20 Sep Big Stone

Mostly cloudy. A slight chance of very light drizzle this morning. Highs in the mid 60s. Northeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 20 Sep Big Stone

Cloudy. Lows in the upper 40s. East Winds 5 to 10 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

    67 °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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