Flat Lake Weather Forecast

    • 66
    • 89

    Decreasing Clouds

    • 65
    • 93

    Severe Tstms

    • 59
    • 83

    Breezy

    • 57
    • 79

    Partly Sunny

    • 61
    • 84

    Mostly Sunny

    • 62
    • 85

    Slight Chance Thunderstorms

    • 65
    • 88

    Slight Chance Thunderstorms

Today 18 Jul McHenry

Mostly clear. Southwest Winds around 5 Mph.

Tonight 18 Jul McHenry

Increasing Clouds. Lows in the mid 60s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

July Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 8 July, 2026

    51.8 °F

  • Average July

    72.6 °F

  • Highest 12 July, 2026

    93.2 °F

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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