Chehalis Weather Forecast

    • 49
    • 77

    Sunny

    • 49
    • 80

    Mostly Sunny

    • 48
    • 74

    Partly Sunny

    • 48
    • 74

    Partly Sunny

    • 49
    • 76

    Partly Sunny

    • 49
    • 73

    Partly Sunny

Today 16 Sep Lowlands of Lewis and Southern Thurston Counties

Sunny. Highs in the mid to upper 70s. North wind to 10 Mph.

Tonight 16 Sep Lowlands of Lewis and Southern Thurston Counties

Clear. Lows near 50. North wind to 10 Mph.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F

  • Average September

    59.6 °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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