Cottonwood Lake Weather Forecast

    • 41
    • 72

    Mostly Sunny

    • 38
    • 61

    Mostly Sunny

    • 45
    • 63

    Partly Sunny

    • 40
    • 66

    Mostly Sunny

    • 41
    • 62

    Mostly Sunny

    • 51
    • 68

    Partly Sunny

    • 48
    • 73

    Mostly Sunny

Today 30 Sep McHenry

Mostly clear. Northwest Winds around 5 Mph.

Tonight 30 Sep McHenry

Mostly clear. Lows in the lower 40s. Northwest Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Cottonwood Lake Temperature Statistics

September Temperature

Harvey Municipal Airport (34.8 miles)

  • Lowest 13 September, 2026

    35.6 °F

  • Average September

    60.5 °F

  • Highest 4 September, 2026

    84.2 °F

Climate (2021–2026)

Harvey Municipal Airport (34.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.7 °F
Get WillyWeather+ to remove ads