Marathon Weather Forecast

    • 52
    • 71

    Mostly Sunny

    • 59
    • 79

    Chance Thunderstorms

    • 58
    • 79

    Slight Chance Thunderstorms

    • 59
    • 81

    Partly Sunny

    • 64
    • 86

    Slight Chance Thunderstorms

    • 67
    • 89

    Slight Chance Thunderstorms

    • 62
    • 89

    Slight Chance Thunderstorms

Today 7 Sep Buena Vista

Sunny. Highs in the lower 70s. Southeast Winds around 5 Mph.

Tonight 7 Sep Buena Vista

Partly cloudy with a chance of Sprinkles. Not as cool with Lows in the lower 50s. Southeast Winds 5 to 10 Mph.

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Marathon Temperature Statistics

September Temperature

Storm Lake (21.7 miles)

  • Lowest 4 September, 2025

    44.6 °F

  • Average September

    59.9 °F

  • Highest 2 September, 2025

    75.2 °F

Climate (2020–Present)

Storm Lake (21.7 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    48.4 °F

  • Average High 2020–2025

    58.4 °F
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