Chehalis Weather Forecast

    • 58
    • 85

    Chance Rain

    • 56
    • 74

    Chance Rain

    • 54
    • 76

    Mostly Cloudy

    • 56
    • 84

    Partly Sunny

    • 54
    • 82

    Partly Sunny

    • 52
    • 76

    Partly Sunny

Today 21 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Highs in the lower to mid 80s. Light wind becoming north around 10 Mph in the afternoon.

Tonight 21 Aug Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A chance of Showers after midnight. Lows in the mid to upper 50s. West wind 10 to 15 Mph.

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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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