Chehalis Weather Forecast

    • 43
    • 63

    Increasing Clouds

    • 40
    • 67

    Mostly Sunny

    • 48
    • 68

    Mostly Cloudy

    • 47
    • 63

    Chance Rain

    • 45
    • 65

    Mostly Cloudy

    • 44
    • 64

    Partly Sunny

Today 26 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly sunny. Patchy fog in the morning. Highs in the lower to mid 60s. Light wind becoming north to 10 Mph in the afternoon.

Tonight 26 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Lows in the lower to mid 40s. North wind to 10 Mph. Gusts to 20 Mph 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

    58.7 °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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