Chehalis Weather Forecast

    • 41
    • 53

    Rain Showers

    • 38
    • 56

    Rain Showers

    • 40
    • 65

    Mostly Cloudy

    • 43
    • 68

    Mostly Cloudy

    • 43
    • 68

    Mostly Cloudy

    • 46
    • 73

    Partly Sunny

Today 15 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A chance of rain late in the morning. Rain likely early in the Afternoon, then Showers likely and a slight chance of Thunderstorms late in the afternoon. Rainfall Amounts less than a tenth of an inch Likely, except higher Amounts possible in Thunderstorms. Highs in the lower to mid 50s. Southwest wind to 10 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 15 May Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Showers likely and a slight chance of Thunderstorms in the Evening, then rain at Times late in the evening. A chance of rain after midnight. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Lows near 40. Southwest wind to 10 Mph with Gusts to 20 Mph.

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Chehalis Temperature Statistics

May Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 1 May, 2026

    44.6 °F
  • Average May

    60 °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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