Chehalis Weather Forecast

    • 55
    • 82

    Increasing Clouds

    • 48
    • 72

    Mostly Cloudy

    • 48
    • 68

    Mostly Cloudy

    • 49
    • 70

    Chance Rain

    • 49
    • 73

    Partly Sunny

    • 50
    • 76

    Mostly Sunny

Today 9 Sep Lowlands of Lewis and Southern Thurston Counties

Sunny. Highs in the lower to mid 80s. Light wind.

Tonight 9 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly clear. 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

    58.8 °F

  • Highest 6 September, 2026

    75.2 °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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