Chehalis Weather Forecast

    • 48
    • 72

    Increasing Clouds

    • 49
    • 72

    Chance Rain

    • 51
    • 74

    Mostly Cloudy

    • 51
    • 72

    Mostly Cloudy

    • 52
    • 75

    Partly Sunny

    • 55
    • 83

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

Today 4 Sep Lowlands of Lewis and Southern Thurston Counties

Partly sunny. Highs in the lower 70s. Light wind.

Tonight 4 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy. Lows in the mid 40s to lower 50s. Light wind.

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  • Temperature Real-Time

Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 1 September, 2026

    55.4 °F

  • Average September

    61 °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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