Chehalis Weather Forecast

    • 54
    • 81

    Mostly Cloudy

    • 54
    • 71

    Chance Rain

    • 50
    • 65

    Rain

    • 48
    • 66

    Rain Showers

    • 49
    • 69

    Chance Rain

    • 52
    • 73

    Mostly Cloudy

Today 31 Aug Lowlands of Lewis and Southern Thurston Counties

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

Tonight 31 Aug Lowlands of Lewis and Southern Thurston Counties

Partly cloudy. Patchy fog in the morning. Lows in the lower to mid 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

    43.7 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    61.3 °F
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