Lannon Lake Weather Forecast

    • 44
    • 60

    Areas Fog

    • 44
    • 64

    Partly Sunny

    • 50
    • 68

    Rain Showers

    • 53
    • 68

    Slight Chance Rain Showers

    • 55
    • 70

    Chance Rain Showers

    • 53
    • 65

    Slight Chance Rain Showers

Today 21 Sep Big Stone

Patchy fog this morning. Mostly cloudy with a slight chance of Showers this Morning, then partly sunny this afternoon. Highs in the upper 50s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 21 Sep Big Stone

Mostly cloudy in the Evening, then becoming partly cloudy. Areas of fog. Lows in the mid 40s. East 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

    66.6 °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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