Onalaska Weather Forecast

    • 77
    • 95

    Slight Chance Thunderstorms

    • 76
    • 94

    Mostly Sunny

    • 76
    • 94

    Slight Chance Thunderstorms

    • 76
    • 93

    Mostly Sunny

    • 76
    • 93

    Partly Sunny

    • 75
    • 92

    Mostly Sunny

Today 12 Sep Polk

Mostly sunny with a slight chance of Showers and Thunderstorms. Hot with Highs in the mid 90s. South Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 110.

Tonight 12 Sep Polk

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Humid with Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Onalaska Temperature Statistics

September Temperature

Huntsville, Huntsville Municipal Airport (28 miles)

  • Lowest 10 September, 2026

    75 °F

  • Average September

    84.5 °F

  • Highest 7 September, 2026

    97.6 °F

Climate (2021–2026)

Huntsville, Huntsville Municipal Airport (28 miles)

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  • Average Low 2021–2026

    61.6 °F

  • Average 2021–2026

    71.6 °F

  • Average High 2021–2026

    81.9 °F
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