Chehalis Weather Forecast

    • 40
    • 53

    Rain Showers

    • 37
    • 57

    Rain Showers

    • 40
    • 65

    Mostly Cloudy

    • 42
    • 68

    Mostly Cloudy

    • 43
    • 67

    Mostly Cloudy

    • 44
    • 70

    Partly Sunny

    • 45
    • 69

    Partly Sunny

Today 15 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy in the Morning, then a chance of Showers late in the morning. Showers and a slight 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 lower to mid 50s. South wind 10 to 15 Mph becoming southwest in the afternoon. Gusts to 25 Mph.

Tonight 15 May Lowlands of Lewis and Southern Thurston Counties

Showers and a slight chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Lows near 40. Southwest wind around 10 Mph becoming south to 10 Mph 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

    59.6 °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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