Chehalis Weather Forecast

    • 58
    • 75

    Mostly Cloudy

    • 55
    • 76

    Mostly Cloudy

    • 57
    • 82

    Mostly Sunny

    • 55
    • 84

    Partly Sunny

    • 52
    • 75

    Slight Chance Thunderstorms

    • 50
    • 75

    Partly Sunny

Today 22 Aug Lowlands of Lewis and Southern Thurston Counties

Cloudy in the morning then becoming partly sunny. Highs in the 70s. Southwest wind to 10 Mph.

Tonight 22 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A slight chance of Showers after midnight. Lows in the mid to upper 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

    65.7 °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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