Chehalis Weather Forecast

    • 46
    • 66

    Mostly Cloudy

    • 49
    • 72

    Mostly Cloudy

    • 51
    • 73

    Partly Sunny

    • 50
    • 73

    Partly Sunny

    • 50
    • 77

    Partly Sunny

    • 51
    • 72

    Mostly Cloudy

    • 48
    • 70

    Mostly Cloudy

Today 30 Sep Lowlands of Lewis and Southern Thurston Counties

Partly sunny. Highs near 70.

Tonight 30 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 40s. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 28 September, 2026

    39.2 °F

  • Average September

    58.1 °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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