Chehalis Weather Forecast

    • 47
    • 61

    Chance Rain

    • 46
    • 66

    Mostly Cloudy

    • 48
    • 70

    Mostly Cloudy

    • 49
    • 71

    Partly Sunny

    • 48
    • 73

    Partly Sunny

    • 50
    • 76

    Partly Sunny

    • 49
    • 71

    Mostly Cloudy

Today 29 Sep Lowlands of Lewis and Southern Thurston Counties

Partly sunny. Highs in the upper 60s.

Tonight 29 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A chance of rain in the evening. Areas of fog late in the evening. Patchy fog after Midnight, then Areas of fog late in the night. Lows in the mid to upper 40s. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 23 September, 2026

    44.6 °F

  • Average September

    58.3 °F

  • Highest 9 September, 2026

    82.4 °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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