Chehalis Weather Forecast

    • 52
    • 75

    Increasing Clouds

    • 50
    • 70

    Decreasing Clouds

    • 52
    • 77

    Partly Sunny

    • 54
    • 84

    Mostly Sunny

    • 50
    • 74

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 49
    • 70

    Partly Sunny

Today 6 Sep Lowlands of Lewis and Southern Thurston Counties

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

Tonight 6 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy with isolated Showers late in the Evening, then mostly cloudy after midnight. Lows in the upper 40s to mid 50s. Southwest wind to 10 Mph becoming south with Gusts to 20 Mph after midnight.

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  • Temperature Real-Time

Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 4 September, 2026

    48.2 °F

  • Average September

    59.1 °F

  • Highest 4 September, 2026

    71.6 °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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