Chehalis Weather Forecast

    • 54
    • 80

    Increasing Clouds

    • 54
    • 80

    Mostly Cloudy

    • 56
    • 86

    Partly Sunny

    • 55
    • 79

    Mostly Cloudy

    • 54
    • 72

    Mostly Cloudy

    • 53
    • 79

    Mostly Cloudy

Today 18 Aug Lowlands of Lewis and Southern Thurston Counties

Cloudy in the morning then becoming mostly sunny. Highs in the mid 70s to lower 80s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 18 Aug Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 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

    65.5 °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

    43.6 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    61.3 °F
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