Chehalis Weather Forecast

    • 47
    • 68

    Increasing Clouds

    • 47
    • 68

    Mostly Cloudy

    • 49
    • 78

    Mostly Sunny

    • 49
    • 81

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 49
    • 75

    Partly Sunny

Today 14 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Highs in the mid to upper 60s. South wind to 10 Mph in the morning becoming light.

Tonight 14 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the mid to upper 40s. 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

    59.9 °F

  • Highest 9 September, 2026

    82.4 °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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