Lake Onalaska Weather Forecast

    • 62
    • 83

    Rain Showers Likely

    • 60
    • 76

    Rain Showers

    • 60
    • 74

    Chance Thunderstorms

    • 61
    • 77

    Chance Thunderstorms

    • 59
    • 77

    Chance Rain Showers

    • 55
    • 73

    Slight Chance Rain Showers

Today 18 Sep La Crosse

Partly sunny. Highs in the mid 80s. Light Winds.

Tonight 18 Sep La Crosse

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 60s. Southeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Onalaska Temperature Statistics

September Temperature

La Crosse - La Crosse Regional Airport (2.5 miles)

  • Lowest 7 September, 2025

    39.9 °F

  • Average September

    64.9 °F

  • Highest 16 September, 2025

    87.1 °F

Climate (2020–Present)

La Crosse - La Crosse Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    40.9 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    59.8 °F
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