Chehalis Weather Forecast

    • 58
    • 88

    Increasing Clouds

    • 58
    • 84

    Chance Rain

    • 56
    • 71

    Chance Rain

    • 54
    • 73

    Mostly Cloudy

    • 55
    • 82

    Partly Sunny

    • 53
    • 80

    Partly Sunny

Today 20 Aug Lowlands of Lewis and Southern Thurston Counties

Sunny. Highs in the mid to upper 80s. Light wind becoming north around 10 Mph in the afternoon.

Tonight 20 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly clear. 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 3 August, 2026

    48.2 °F

  • Average August

    65.4 °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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