Yellowstone Weather Forecast

    • 59
    • 85

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 59
    • 84

    Slight Chance Rain Showers

    • 58
    • 78

    Chance Rain Showers

    • 61
    • 78

    Chance Thunderstorms

    • 60
    • 77

    Chance Rain Showers

    • 58
    • 77

    Chance Rain Showers

Today 16 Sep Lafayette

Sunny. Southeast Winds up to 5 Mph.

Tonight 16 Sep Lafayette

Mostly clear. Patchy fog early in the morning. Lows around 60. Southeast Winds up to 5 Mph.

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Yellowstone Temperature Statistics

September Temperature

Iowa County Airport (14.3 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    60.8 °F

  • Highest 1 September, 2025

    71.6 °F

Climate (2020–Present)

Iowa County Airport (14.3 miles)

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  • Average Low 2020–2025

    41.6 °F

  • Average 2020–2025

    50.1 °F

  • Average High 2020–2025

    58.7 °F
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