Lannon Lake Weather Forecast

    • 56
    • 65

    Rain Showers Likely

    • 56
    • 67

    Rain Showers Likely

    • 55
    • 66

    Rain Showers Likely

    • 55
    • 71

    Mostly Cloudy

    • 53
    • 70

    Rain Showers

    • 47
    • 62

    Chance Rain Showers

Today 24 Sep Big Stone

Showers with a slight chance of Thunderstorms this Morning, then a slight chance of Showers this afternoon. Highs in the mid 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 24 Sep Big Stone

Cloudy. Lows in the upper 50s. Southeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Lannon Lake Temperature Statistics

September Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 16 September, 2026

    41 °F

  • Average September

    64.9 °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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