Lake Onalaska Weather Forecast

    • 54
    • 81

    Sunny

    • 56
    • 79

    Sunny

    • 63
    • 81

    Rain Showers Likely

    • 53
    • 77

    Partly Sunny

    • 59
    • 74

    Rain Showers

    • 57
    • 78

    Rain Showers Likely

Today 9 Sep La Crosse

Sunny. Near steady temperature in the lower 80s. West Winds 10 to 15 Mph.

Tonight 9 Sep La Crosse

Mostly clear. Cooler with Lows in the lower 50s. Northwest Winds 5 to 10 Mph.

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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 6 September, 2026

    65.6 °F

  • Average September

    77.5 °F

  • Highest 1 September, 2026

    90.6 °F

Climate (2021–2026)

La Crosse - La Crosse Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    40.9 °F

  • Average 2021–2026

    50.3 °F

  • Average High 2021–2026

    59.9 °F
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