Chehalis Weather Forecast

    • 42
    • 60

    Rain Showers Likely

    • 42
    • 63

    Mostly Cloudy

    • 41
    • 67

    Partly Sunny

    • 47
    • 66

    Chance Rain

    • 48
    • 63

    Chance Rain

    • 45
    • 65

    Chance Rain

Today 25 Sep Lowlands of Lewis and Southern Thurston Counties

Windy. Showers through the day. A slight 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 mid 50s to lower 60s. Southeast wind 15 to 25 Mph becoming west 15 to 30 Mph in the afternoon. Gusts to 45 Mph.

Tonight 25 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy with a slight chance of Showers in the Evening, then partly cloudy after midnight. Lows in the lower to mid 40s. West wind 10 to 15 Mph with Gusts to 30 Mph becoming south after midnight.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 23 September, 2026

    44.6 °F

  • Average September

    58.9 °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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