Lannon Lake Weather Forecast

    • 70
    • 93

    Becoming Sunny

    • 72
    • 95

    Mostly Sunny

    • 69
    • 95

    Mostly Sunny

    • 68
    • 89

    Partly Sunny

    • 69
    • 89

    Partly Sunny

    • 63
    • 84

    Partly Sunny

Today 15 Jul Big Stone

Mostly sunny. Hot with Highs in the lower 90s. South Winds around 5 Mph.

Tonight 15 Jul Big Stone

Mostly clear. Humid with Lows around 70. Southeast Winds 5 to 10 Mph.

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Lannon Lake Temperature Statistics

July Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 9 July, 2026

    59 °F

  • Average July

    74.3 °F

  • Highest 11 July, 2026

    89.6 °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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