Chehalis Weather Forecast

    • 50
    • 69

    Mostly Cloudy

    • 50
    • 69

    Rain

    • 49
    • 69

    Chance Rain

    • 48
    • 72

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

    • 51
    • 83

    Mostly Sunny

Today 11 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Highs near 70. Light wind.

Tonight 11 Sep Lowlands of Lewis and Southern Thurston Counties

Cloudy. 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

    59.5 °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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