Onalaska Weather Forecast

    • 35
    • 51

    Rain

    • 36
    • 41

    Rain/Snow

    • 36
    • 43

    Rain

    • 37
    • 44

    Rain

    • 36
    • 42

    Rain

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    • 44

    Chance Rain

Today 18 Dec Foothills and Valleys of Thurston and Lewis Counties

Breezy, rain. Rainfall Amounts a half inch to one inch possible. Highs in the lower to mid 50s. South wind 15 to 25 Mph. Gusts to 40 Mph increasing to 50 Mph in the afternoon.

Tonight 18 Dec Foothills and Valleys of Thurston and Lewis Counties

Rain in the Evening, then a chance of rain after midnight. A slight chance of snow in the morning. No snow accumulation. Lows in the mid 30s. West wind 10 to 20 Mph with Gusts to 35 Mph decreasing to 10 Mph or less with Gusts to 25 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Onalaska Temperature Statistics

December Temperature

Chehalis-Centralia Airport (14.3 miles)

  • Lowest 1 December, 2025

    33.8 °F

  • Average December

    49.3 °F

  • Highest 15 December, 2025

    60.8 °F

Climate (2020–Present)

Chehalis-Centralia Airport (14.3 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    52.1 °F

  • Average High 2020–2025

    61.4 °F
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