Chehalis Weather Forecast

    • 36
    • 57

    Slight Chance Rain

    • 42
    • 67

    Mostly Cloudy

    • 44
    • 68

    Partly Sunny

    • 43
    • 69

    Mostly Cloudy

    • 44
    • 74

    Partly Sunny

    • 46
    • 75

    Partly Sunny

    • 45
    • 74

    Partly Sunny

Today 16 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A chance of Showers in the Morning, then Showers likely early in the afternoon. A chance of Thunderstorms in the afternoon. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Highs in the 50s. Southwest wind 10 to 15 Mph becoming west 10 to 20 Mph with Gusts to 30 Mph in the afternoon.

Tonight 16 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy in the evening then becoming partly cloudy. A slight chance of rain in the evening. Lows in the mid to upper 30s. West wind 10 to 15 Mph with Gusts to 25 Mph becoming southwest after midnight.

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Chehalis Temperature Statistics

May Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 1 May, 2026

    44.6 °F
  • Average May

    59.1 °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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