Chehalis Weather Forecast

    • 44
    • 70

    Increasing Clouds

    • 45
    • 69

    Mostly Cloudy

    • 48
    • 65

    Rain

    • 43
    • 62

    Chance Thunderstorms

    • 43
    • 64

    Mostly Cloudy

    • 45
    • 63

    Mostly Cloudy

Today 22 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy until late afternoon then becoming sunny. Highs near 70. Light wind becoming west to 10 Mph in the afternoon.

Tonight 22 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy. Lows in the 40s. West wind to 10 Mph in the evening becoming light.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F

  • Average September

    59.1 °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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