Chehalis Weather Forecast

    • 49
    • 69

    Chance Rain Showers

    • 50
    • 70

    Mostly Cloudy

    • 52
    • 77

    Mostly Cloudy

    • 53
    • 73

    Rain Likely

    • 51
    • 65

    Rain

    • 49
    • 67

    Rain Likely

Today 29 Aug Lowlands of Lewis and Southern Thurston Counties

Partly sunny. A slight chance of Showers in the Morning, then a chance of Showers early in the afternoon. A slight chance of Showers late in the afternoon. Highs near 70. Southwest wind to 10 Mph becoming west with Gusts to 20 Mph in the afternoon.

Tonight 29 Aug Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the mid 40s to lower 50s. West wind to 10 Mph with Gusts to 20 Mph becoming south after midnight.

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Chehalis Temperature Statistics

August Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 3 August, 2026

    48.2 °F

  • Average August

    65.8 °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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