Yellowstone Lake Weather Forecast

    • 64
    • 83

    Chance Rain Showers

    • 62
    • 82

    Slight Chance Thunderstorms

    • 62
    • 86

    Slight Chance Thunderstorms

    • 62
    • 86

    Slight Chance Thunderstorms

    • 62
    • 87

    Partly Sunny

Today 12 Sep Lafayette

Mostly sunny. Southeast Winds 5 to 10 Mph.

Tonight 12 Sep Lafayette

Warmer. Partly cloudy in the Evening, then mostly cloudy with a 40 percent chance of light Showers and Thunderstorms in the late evening and overnight. Lows in the mid 60s. Southeast Winds 5 to 10 Mph.

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Yellowstone Lake Temperature Statistics

September Temperature

Iowa County Airport (15.5 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    61.5 °F

  • Highest 1 September, 2025

    71.6 °F

Climate (2020–Present)

Iowa County Airport (15.5 miles)

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  • Average Low 2020–2025

    41.6 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    58.7 °F
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