Flat Lake Weather Forecast

    • 62
    • 84

    Slight Chance Thunderstorms

    • 66
    • 91

    Rain Showers Likely

    • 58
    • 84

    Slight Chance Thunderstorms

    • 57
    • 77

    Rain Showers Likely

    • 55
    • 76

    Partly Sunny

    • 59
    • 81

    Chance Thunderstorms

    • 60
    • 83

    Chance Thunderstorms

Today 4 Jul McHenry

Mostly clear. Light and variable Winds.

Tonight 4 Jul McHenry

Mostly clear. Lows in the lower 60s. East Winds around 5 Mph, becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

July Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 2 July, 2026

    55.4 °F

  • Average July

    66.4 °F

  • Highest 1 July, 2026

    77 °F

Climate (2021–2026)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    51.8 °F
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