Lake Tomah Weather Forecast

    • 45
    • 72

    Mostly Cloudy

    • 53
    • 72

    Rain Showers Likely

    • 51
    • 75

    Rain Showers Likely

    • 54
    • 69

    Rain Showers

    • 51
    • 73

    Chance Thunderstorms

    • 46
    • 68

    Slight Chance Rain Showers

Today 15 Sep Monroe

Mostly cloudy. A slight chance of Showers and Thunderstorms this morning. Highs in the lower 70s. West Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 15 Sep Monroe

Mostly cloudy in the Evening, then becoming partly cloudy. Cooler. Less humid with Lows in the mid 40s. Northwest Winds around 5 Mph, becoming north after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Tomah Temperature Statistics

September Temperature

Sparta, Sparta / Fort McCoy Airport (10.6 miles)

  • Lowest 13 September, 2026

    42.4 °F

  • Average September

    70.8 °F

  • Highest 1 September, 2026

    91 °F

Climate (2021–2026)

Sparta, Sparta / Fort McCoy Airport (10.6 miles)

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  • Average Low 2021–2026

    35.3 °F

  • Average 2021–2026

    47.8 °F

  • Average High 2021–2026

    58.5 °F
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