Chehalis Weather Forecast

    • 47
    • 72

    Decreasing Clouds

    • 48
    • 81

    Mostly Sunny

    • 49
    • 78

    Partly Sunny

    • 45
    • 76

    Partly Sunny

    • 46
    • 73

    Mostly Cloudy

    • 43
    • 60

    Rain Likely

Today 20 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy in the morning then becoming mostly sunny. Patchy fog in the morning. Highs near 70. Light wind.

Tonight 20 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy in the evening then becoming partly cloudy. Patchy fog in the morning. Lows in the mid to upper 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chehalis Temperature Statistics

May Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 17 May, 2026

    35.6 °F

  • Average May

    57.2 °F

  • Highest 3 May, 2026

    84.2 °F

Climate (2021–Present)

Chehalis-Centralia Airport (1.2 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    52.1 °F

  • Average High 2021–2026

    61.4 °F
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