Chehalis Weather Forecast

    • 50
    • 70

    Rain

    • 51
    • 68

    Rain

    • 47
    • 69

    Mostly Cloudy

    • 48
    • 73

    Mostly Sunny

    • 50
    • 81

    Mostly Sunny

    • 52
    • 84

    Mostly Sunny

Today 12 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Highs near 70. Light wind.

Tonight 12 Sep Lowlands of Lewis and Southern Thurston Counties

Cloudy with a chance of Showers and a slight chance of Thunderstorms in the Evening, then rain after midnight. Patchy fog in the late evening and early morning. Rainfall Amounts a quarter to a half inch Possible, except higher Amounts possible in Thunderstorms. Lows near 50. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F

  • Average September

    60.1 °F

  • Highest 9 September, 2026

    82.4 °F

Climate (2021–2026)

Chehalis-Centralia Airport (1.2 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    61.3 °F
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