Lannon Lake Weather Forecast

    • 52
    • 60

    Rain Showers

    • 51
    • 64

    Mostly Cloudy

    • 48
    • 68

    Mostly Cloudy

    • 44
    • 63

    Partly Sunny

    • 44
    • 65

    Partly Sunny

    • 49
    • 65

    Mostly Cloudy

Today 18 Sep Big Stone

Patchy fog this morning. Showers with a slight chance of Thunderstorms this Morning, then Showers this afternoon. Cooler. Near steady temperature in the upper 50s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 18 Sep Big Stone

Cloudy. A chance of Showers, mainly in the evening. Lows in the lower 50s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 14 September, 2026

    44.6 °F

  • Average September

    67.9 °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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