Flat Lake Weather Forecast

    • 67
    • 90

    Mostly Sunny

    • 62
    • 97

    Chance Thunderstorms

    • 49
    • 78

    Chance Thunderstorms

    • 49
    • 75

    Mostly Sunny

    • 56
    • 82

    Partly Sunny

    • 58
    • 84

    Mostly Sunny

    • 59
    • 86

    Mostly Sunny

Today 1 Aug McHenry

Mostly clear. Southeast Winds around 15 Mph.

Tonight 1 Aug McHenry

Increasing Clouds. Lows in the upper 60s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

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Flat Lake Temperature Statistics

August Temperature

Harvey Municipal Airport (22.4 miles)

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  • Average August

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Climate (2021–2026)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    51.8 °F
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