Clear Lake Weather Forecast

    • 48
    • 68

    Rain Showers Likely

    • 45
    • 57

    Rain Showers Likely

    • 41
    • 60

    Partly Sunny

    • 45
    • 64

    Partly Sunny

    • 49
    • 63

    Mostly Cloudy

    • 52
    • 65

    Mostly Cloudy

    • 53
    • 67

    Slight Chance Rain Showers

Today 20 Sep Cerro Gordo

Mostly cloudy with a slight chance of Showers in the Morning, then partly sunny in the afternoon. Highs around 70. Chance of rain 20 percent.

Tonight 20 Sep Cerro Gordo

Cloudy. A chance of Showers after midnight. Lows in the upper 40s. Northeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

September Temperature

Mason City Municipal Airport (2.5 miles)

  • Lowest 16 September, 2026

    46.7 °F

  • Average September

    69.3 °F

  • Highest 4 September, 2026

    90.6 °F

Climate (2021–2026)

Mason City Municipal Airport (2.5 miles)

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  • Average Low 2021–2026

    37.3 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    58.6 °F
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