Flat Lake Weather Forecast

    • 43
    • 56

    Increasing Clouds

    • 32
    • 57

    Partly Sunny

    • 32
    • 52

    Partly Sunny

    • 27
    • 45

    Partly Sunny

    • 31
    • 48

    Partly Sunny

    • 34
    • 55

    Partly Sunny

Today 8 Nov McHenry

Mostly sunny. Highs in the mid 50s. Southwest Winds around 5 Mph, becoming south with Gusts up to 20 Mph in the afternoon.

Tonight 8 Nov McHenry

Mostly cloudy. Lows in the lower 40s. South Winds around 10 Mph, becoming west after midnight.

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Flat Lake Temperature Statistics

November Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 5 November, 2026

    26.6 °F

  • Average November

    43.7 °F

  • Highest 1 November, 2026

    60.8 °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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