Chehalis Weather Forecast

    • 47
    • 68

    Becoming Sunny

    • 48
    • 77

    Sunny

    • 49
    • 81

    Mostly Sunny

    • 49
    • 77

    Partly Sunny

    • 49
    • 78

    Partly Sunny

    • 50
    • 77

    Partly Sunny

Today 15 Sep Lowlands of Lewis and Southern Thurston Counties

Partly sunny. Areas of fog in the Morning, then patchy fog late in the morning. Highs in the mid to upper 60s. Light wind.

Tonight 15 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly clear. Patchy fog after midnight. Lows in the mid to upper 40s. Light wind becoming north to 10 Mph with Gusts to 20 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

    59.5 °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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