Chehalis Weather Forecast

    • 53
    • 87

    Increasing Clouds

    • 55
    • 80

    Mostly Cloudy

    • 53
    • 74

    Partly Sunny

    • 51
    • 74

    Slight Chance Rain

    • 49
    • 72

    Chance Rain

    • 50
    • 75

    Mostly Cloudy

Today 25 Aug Lowlands of Lewis and Southern Thurston Counties

Sunny. Highs in the 80s. Light wind becoming southwest to 10 Mph with Gusts to 20 Mph in the afternoon.

Tonight 25 Aug Lowlands of Lewis and Southern Thurston Counties

Clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the lower to mid 50s. West wind to 10 Mph with Gusts to 20 Mph in the evening becoming light.

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Chehalis Temperature Statistics

August Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 3 August, 2026

    48.2 °F

  • Average August

    65.7 °F

  • Highest 5 August, 2026

    89.6 °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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