Chehalis Weather Forecast

    • 51
    • 73

    Mostly Cloudy

    • 45
    • 72

    Partly Sunny

    • 47
    • 70

    Mostly Cloudy

    • 47
    • 64

    Rain Likely

    • 43
    • 63

    Chance Rain Showers

    • 43
    • 65

    Mostly Cloudy

Today 21 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Areas of fog in the Morning, then patchy fog late in the morning. Highs in the lower to mid 70s. Light wind.

Tonight 21 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows near 50. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F

  • Average September

    59.5 °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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