Lannon Lake Weather Forecast

    • 47
    • 74

    Sunny

    • 47
    • 71

    Mostly Sunny

    • 56
    • 76

    Partly Sunny

    • 58
    • 73

    Chance Rain

    • 42
    • 67

    Slight Chance Rain

    • 37
    • 54

    Mostly Cloudy

    • 35
    • 52

    Partly Sunny

Today 20 Oct Big Stone

Partly cloudy. Lows in the mid 30s. Highs in the lower 50s.

Tonight 20 Oct Big Stone

Clear. Lows in the mid 40s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Lannon Lake Temperature Statistics

October Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 2 October, 2026

    33.8 °F

  • Average October

    54.6 °F

  • Highest 10 October, 2026

    93.2 °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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