Chehalis Weather Forecast

    • 50
    • 65

    Rain

    • 42
    • 60

    Rain

    • 42
    • 64

    Mostly Cloudy

    • 41
    • 66

    Partly Sunny

    • 45
    • 65

    Mostly Cloudy

    • 46
    • 65

    Slight Chance Rain

Today 24 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Patchy fog in the morning. A slight chance of rain in the afternoon. Highs in the 60s. Light wind.

Tonight 24 Sep Lowlands of Lewis and Southern Thurston Counties

A chance of rain in the Evening, then rain in the late evening and early morning. A chance of rain in the morning. Rainfall Amounts a half inch to one inch possible. Lows near 50. Light wind becoming southeast to 10 Mph with Gusts to 30 Mph after midnight.

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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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