Chehalis Weather Forecast

    • 37
    • 66

    Mostly Sunny

    • 38
    • 70

    Mostly Sunny

    • 35
    • 61

    Mostly Cloudy

    • 34
    • 59

    Partly Sunny

    • 36
    • 56

    Rain Likely

    • 36
    • 59

    Chance Rain

Today 20 Oct Lowlands of Lewis and Southern Thurston Counties

Sunny. Patchy fog in the morning. Patchy frost in the morning. Highs in the 60s. Northeast wind to 10 Mph becoming north in the afternoon.

Tonight 20 Oct Lowlands of Lewis and Southern Thurston Counties

Mostly clear. Patchy fog and frost in the morning. Lows in the 30s to lower 40s. North wind to 10 Mph in the evening becoming light.

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Chehalis Temperature Statistics

October Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 11 October, 2026

    35.6 °F

  • Average October

    55.1 °F

  • Highest 16 October, 2026

    80.6 °F

Climate (2021–2026)

Chehalis-Centralia Airport (1.2 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    52.1 °F

  • Average High 2021–2026

    61.4 °F
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