Lannon Lake Weather Forecast

    • 68
    • 85

    Chance Rain Showers

    • 67
    • 83

    Rain Showers Likely

    • 69
    • 82

    Rain Showers Likely

    • 61
    • 83

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

    • 56
    • 76

    Partly Sunny

Today 5 Sep Big Stone

Partly sunny with a chance of Showers with a slight chance of Thunderstorms. Humid with Highs in the mid 80s. Southeast Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 5 Sep Big Stone

Mostly clear in the Evening, then mostly cloudy with a chance of Thunderstorms after midnight. Humid with Lows in the upper 60s. Southeast Winds 10 to 15 Mph. Chance of rain 40 percent.

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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

    69.9 °F

  • Highest 2 September, 2026

    84.2 °F

Climate (2021–2026)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    34.7 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.5 °F
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