Lannon Lake Weather Forecast

    • 68
    • 90

    Chance Rain Showers

    • 71
    • 92

    Partly Sunny

    • 66
    • 89

    Rain Showers

    • 64
    • 85

    Slight Chance Thunderstorms

    • 63
    • 83

    Mostly Sunny

    • 67
    • 85

    Mostly Sunny

Today 28 Jul Big Stone

Partly sunny. Patchy smoke. Hot with Highs in the lower 90s. Light and variable Winds, becoming south around 5 Mph.

Tonight 28 Jul Big Stone

Partly cloudy. Patchy smoke. A slight chance of Thunderstorms after midnight. Humid with Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Real-Time

Lannon Lake Temperature Statistics

July Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 22 July, 2026

    50 °F

  • Average July

    74.8 °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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