Lannon Lake Weather Forecast

    • 69
    • 87

    Decreasing Clouds

    • 74
    • 97

    Hot

    • 71
    • 98

    Slight Chance Thunderstorms

    • 68
    • 94

    Mostly Sunny

    • 66
    • 91

    Mostly Sunny

    • 67
    • 92

    Slight Chance Thunderstorms

Today 24 Jul Big Stone

Partly sunny. Humid with Highs in the upper 80s. South Winds 10 to 15 Mph.

Tonight 24 Jul Big Stone

Mostly cloudy with a chance of Sprinkles. Not as cool. Near steady temperature in the upper 60s. South Winds around 5 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

    75.4 °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

    34.8 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    54.4 °F
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