Chehalis Weather Forecast

    • 56
    • 80

    Increasing Clouds

    • 52
    • 77

    Gradual Clearing

    • 53
    • 82

    Partly Sunny

    • 52
    • 81

    Partly Sunny

    • 52
    • 83

    Mostly Cloudy

    • 54
    • 85

    Mostly Cloudy

    • 54
    • 82

    Mostly Cloudy

Today 11 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly sunny. Highs near 80. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 11 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly clear until early morning then becoming mostly cloudy. Lows in the 50s. West wind to 10 Mph in the evening becoming light.

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Chehalis Temperature Statistics

August Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 3 August, 2026

    48.2 °F

  • Average August

    66.2 °F

  • Highest 5 August, 2026

    89.6 °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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