Flat Lake Weather Forecast

    • 52
    • 81

    Rain Showers

    • 52
    • 79

    Breezy

    • 54
    • 79

    Partly Sunny

    • 58
    • 81

    Chance Thunderstorms

    • 57
    • 83

    Partly Sunny

    • 59
    • 84

    Slight Chance Thunderstorms

Today 30 Aug McHenry

Partly sunny. Patchy fog in the morning. A chance of Showers and a slight chance of Thunderstorms in the Morning, then Showers and a chance of Thunderstorms in the afternoon. Highs around 80. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 30 Aug McHenry

Mostly cloudy with Showers and a chance of Thunderstorms in the Evening, then mostly clear after midnight. Lows in the lower 50s. Southwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

August Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 5 August, 2026

    42.8 °F

  • Average August

    67.4 °F

  • Highest 2 August, 2026

    98.6 °F

Climate (2021–2026)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.8 °F
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