Flat Lake Weather Forecast

    • 26
    • 49

    Decreasing Clouds

    • 35
    • 59

    Partly Sunny

    • 39
    • 68

    Partly Sunny

    • 33
    • 60

    Partly Sunny

    • 39
    • 62

    Partly Sunny

    • 43
    • 72

    Partly Sunny

Today 6 May McHenry

Partly sunny. Highs around 50. Northwest Winds 5 to 15 Mph.

Tonight 6 May McHenry

Mostly clear. Lows in the mid 20s. Northeast Winds around 5 Mph with Gusts up to 20 Mph, becoming southeast up to 5 Mph after midnight.

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Flat Lake Temperature Statistics

May Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 1 May, 2026

    24.8 °F

  • Average May

    52.3 °F

  • Highest 3 May, 2026

    73.4 °F

Climate (2021–Present)

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

    51.9 °F
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