Lannon Lake Weather Forecast

    • 73
    • 94

    Increasing Clouds

    • 71
    • 97

    Chance Rain Showers

    • 68
    • 94

    Partly Sunny

    • 69
    • 92

    Mostly Sunny

    • 70
    • 93

    Chance Thunderstorms

    • 68
    • 92

    Chance Thunderstorms

Today 25 Jul Big Stone

Mostly sunny. Hot with Highs in the mid 90s. North Winds around 5 Mph, becoming northeast. Heat index Values up to 101.

Tonight 25 Jul Big Stone

Partly cloudy in the Evening, then becoming mostly cloudy. Much warmer. Humid with Lows in the lower 70s. Southeast Winds 5 to 10 Mph, becoming south after midnight. Heat index Values up to 100 early in the evening.

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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

    74.5 °F

  • Highest 14 July, 2026

    91.4 °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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