Chehalis Weather Forecast

    • 48
    • 75

    Increasing Clouds

    • 48
    • 75

    Partly Sunny

    • 49
    • 76

    Partly Sunny

    • 51
    • 74

    Mostly Cloudy

    • 47
    • 71

    Mostly Cloudy

    • 49
    • 70

    Mostly Cloudy

Today 18 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly sunny. Patchy fog in the morning. Highs in the 70s. Light wind.

Tonight 18 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly clear in the evening 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 5 September, 2026

    46.4 °F

  • Average September

    59.5 °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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