Lannon Lake Weather Forecast

    • 41
    • 64

    Increasing Clouds

    • 43
    • 68

    Partly Sunny

    • 44
    • 62

    Rain Showers Likely

    • 44
    • 65

    Partly Sunny

    • 50
    • 78

    Slight Chance Rain Showers

    • 55
    • 86

    Mostly Sunny

Today 20 May Big Stone

Areas of frost this morning. Mostly sunny. Not as cool with Highs in the mid 60s. South Winds 5 to 10 Mph.

Tonight 20 May Big Stone

Partly cloudy. Lows in the lower 40s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

May Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 6 May, 2026

    28.4 °F

  • Average May

    54.3 °F

  • Highest 14 May, 2026

    80.6 °F

Climate (2021–Present)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    34.7 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.5 °F
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