Chehalis Weather Forecast

    • 41
    • 67

    Mostly Sunny

    • 48
    • 68

    Chance Rain

    • 45
    • 62

    Rain Likely

    • 44
    • 66

    Mostly Cloudy

    • 47
    • 69

    Mostly Cloudy

    • 47
    • 68

    Partly Sunny

    • 46
    • 69

    Partly Sunny

Today 27 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly sunny. Highs near 70.

Tonight 27 Sep Lowlands of Lewis and Southern Thurston Counties

Clear until early morning then becoming partly cloudy. Lows near 40. 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

    58.6 °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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