Lannon Lake Weather Forecast

    • 59
    • 91

    Chance Thunderstorms

    • 56
    • 90

    Partly Sunny

    • 56
    • 86

    Mostly Sunny

    • 56
    • 88

    Partly Sunny

    • 54
    • 82

    Partly Sunny

    • 53
    • 81

    Partly Sunny

Today 26 May Big Stone

Partly sunny. A chance of Thunderstorms this afternoon. Hot with Highs in the lower 90s. Southeast Winds 15 to 20 Mph. Chance of rain 30 percent.

Tonight 26 May Big Stone

Partly cloudy in the Evening, then becoming mostly cloudy. A 50 percent chance of Thunderstorms. Lows in the upper 50s. Southeast Winds 5 to 10 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

    54.1 °F

  • Highest 24 May, 2026

    84.2 °F

Climate (2021–Present)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    34.6 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.4 °F
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