Chehalis Weather Forecast

    • 49
    • 72

    Chance Rain Showers

    • 51
    • 75

    Increasing Clouds

    • 50
    • 70

    Mostly Cloudy

    • 52
    • 76

    Partly Sunny

    • 54
    • 83

    Mostly Sunny

    • 53
    • 79

    Partly Sunny

    • 52
    • 73

    Mostly Cloudy

Today 5 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A slight chance of Thunderstorms in the afternoon. Highs in the upper 60s to mid 70s. Light wind.

Tonight 5 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly clear until early morning then becoming mostly cloudy. Lows in the mid 40s to lower 50s. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 3 September, 2026

    51.8 °F

  • Average September

    59.7 °F

  • Highest 1 September, 2026

    66.2 °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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