Lannon Lake Weather Forecast

    • 55
    • 71

    Chance Rain Showers

    • 52
    • 76

    Mostly Cloudy

    • 45
    • 64

    Partly Sunny

    • 48
    • 63

    Mostly Cloudy

    • 46
    • 65

    Slight Chance Rain Showers

    • 43
    • 61

    Mostly Sunny

Today 29 Sep Big Stone

Patchy fog late this morning. A slight chance of Thunderstorms. Showers. Highs in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 80 percent.

Tonight 29 Sep Big Stone

Mostly cloudy in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the mid 50s. Southwest Winds around 5 Mph.

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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

    64.4 °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

    54.4 °F
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