Mirror Lake State Park Weather Forecast

    • 62
    • 87

    Partly Sunny

    • 58
    • 83

    Partly Sunny

    • 57
    • 77

    Chance Thunderstorms

    • 59
    • 78

    Chance Thunderstorms

    • 60
    • 79

    Chance Rain Showers

    • 57
    • 79

    Chance Rain Showers

Today 17 Sep Sauk

Sunny. A 20 percent chance of light Showers in the morning. Highs in the mid 80s. Southwest Winds up to 5 Mph.

Tonight 17 Sep Sauk

Partly cloudy. Lows in the lower 60s. Calm Winds.

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Mirror Lake State Park Temperature Statistics

September Temperature

Baraboo Wisconsin Dells Airport (3.1 miles)

  • Lowest 7 September, 2025

    36.9 °F

  • Average September

    60.7 °F

  • Highest 14 September, 2025

    86.5 °F

Climate (2020–Present)

Baraboo Wisconsin Dells Airport (3.1 miles)

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  • Average Low 2020–2025

    38 °F

  • Average 2020–2025

    47.7 °F

  • Average High 2020–2025

    57.3 °F
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