Chehalis Weather Forecast

    • 47
    • 64

    Chance Thunderstorms

    • 48
    • 72

    Mostly Cloudy

    • 49
    • 73

    Chance Rain Showers

    • 51
    • 76

    Mostly Cloudy

    • 52
    • 73

    Mostly Cloudy

    • 52
    • 75

    Partly Sunny

    • 54
    • 80

    Partly Sunny

Today 3 Sep Lowlands of Lewis and Southern Thurston Counties

Showers in the Morning, then Showers likely and a chance of Thunderstorms in the afternoon. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Highs in the lower to mid 60s. South wind 10 to 15 Mph.

Tonight 3 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy then becoming partly cloudy after midnight then becoming mostly cloudy. A slight chance of rain in the evening. Lows in the 40s. Light wind.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 1 September, 2026

    55.4 °F

  • Average September

    61.8 °F

  • Highest 1 September, 2026

    66.2 °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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