Mason City Weather Forecast

    • 67
    • 91

    Mostly Sunny

    • 66
    • 86

    Chance Thunderstorms

    • 64
    • 81

    Chance Rain Showers

    • 66
    • 81

    Chance Thunderstorms

    • 65
    • 86

    Chance Thunderstorms

    • 58
    • 83

    Chance Rain Showers

    • 57
    • 77

    Partly Sunny

Today 4 Sep Cerro Gordo

Sunny. Near steady temperature in the upper 80s. Southwest Winds around 5 Mph. Heat index Values up to 101.

Tonight 4 Sep Cerro Gordo

Mostly clear. Humid with Lows in the upper 60s. Light and variable Winds, becoming northeast around 5 Mph after midnight. Heat index Values up to 100 early in the evening.

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Mason City Temperature Statistics

September Temperature

Mason City Municipal Airport (6.2 miles)

  • Lowest 1 September, 2026

    62.7 °F

  • Average September

    74.8 °F

  • Highest 1 September, 2026

    87.7 °F

Climate (2021–2026)

Mason City Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    37.2 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    58.6 °F
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