Lannon Lake Weather Forecast

    • 54
    • 65

    Rain Showers

    • 55
    • 63

    Rain Showers Likely

    • 56
    • 66

    Rain Showers

    • 56
    • 69

    Mostly Cloudy

    • 57
    • 71

    Chance Rain Showers

    • 53
    • 70

    Rain Showers Likely

Today 23 Sep Big Stone

Mostly cloudy. Highs in the mid 60s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 23 Sep Big Stone

Cloudy. A slight chance of Thunderstorms in the Evening, then Showers with a chance of Thunderstorms after midnight. Lows in the mid 50s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 16 September, 2026

    41 °F

  • Average September

    65.3 °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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