Chehalis Weather Forecast

    • 49
    • 72

    Increasing Clouds

    • 50
    • 70

    Cloudy

    • 49
    • 67

    Rain Showers Likely

    • 48
    • 71

    Partly Sunny

    • 49
    • 74

    Partly Sunny

    • 50
    • 75

    Partly Sunny

Today 10 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Patchy fog in the morning. Highs in the lower to mid 70s. West wind to 10 Mph. Gusts to 20 Mph in the afternoon.

Tonight 10 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy after midnight then becoming mostly cloudy. Lows in the lower to mid 50s. 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

    59.2 °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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