Lannon Lake Weather Forecast

    • 59
    • 77

    Slight Chance Thunderstorms

    • 60
    • 81

    Partly Sunny

    • 62
    • 80

    Mostly Sunny

    • 59
    • 82

    Rain Showers

    • 53
    • 74

    Partly Sunny

    • 57
    • 76

    Mostly Sunny

Today 31 Jul Big Stone

Mostly cloudy. A slight chance of Showers Early, then a slight chance of Thunderstorms. Patchy smoke. Highs in the upper 70s. Northeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 31 Jul Big Stone

Mostly cloudy in the Evening, then clearing. Patchy smoke in the evening. Humid with Lows in the upper 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lannon Lake Temperature Statistics

July Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 22 July, 2026

    50 °F

  • Average July

    75.2 °F

  • Highest 26 July, 2026

    93.2 °F

Climate (2021–2026)

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

    54.4 °F
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