Chehalis Weather Forecast

    • 57
    • 86

    Partly Sunny

    • 54
    • 84

    Decreasing Clouds

    • 54
    • 79

    Mostly Cloudy

    • 53
    • 81

    Partly Sunny

    • 54
    • 83

    Mostly Sunny

    • 56
    • 86

    Mostly Sunny

    • 56
    • 87

    Partly Sunny

Today 28 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly sunny. Patchy fog in the morning. Highs in the mid 70s to lower 80s. Light wind.

Tonight 28 Aug Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid to upper 50s. Light wind.

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Chehalis Temperature Statistics

August Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 8 August, 2025

    48.2 °F

  • Average August

    67.2 °F

  • Highest 12 August, 2025

    95 °F

Climate (2020–Present)

Chehalis-Centralia Airport (1.2 miles)

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  • Average Low 2020–2025

    43.6 °F

  • Average 2020–2025

    52 °F

  • Average High 2020–2025

    61.4 °F
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