Chehalis Weather Forecast

    • 51
    • 66

    Rain

    • 47
    • 70

    Mostly Cloudy

    • 47
    • 71

    Partly Sunny

    • 49
    • 79

    Sunny

    • 52
    • 83

    Mostly Sunny

    • 52
    • 85

    Mostly Sunny

Today 13 Sep Lowlands of Lewis and Southern Thurston Counties

Becoming partly sunny late in the afternoon. Rain in the Morning, then a chance of rain early in the afternoon. A slight chance of rain late in the afternoon. Rainfall Amounts a quarter to a half inch possible. Highs in the 60s. South wind to 10 Mph becoming southwest around 10 Mph with Gusts to 20 Mph in the afternoon.

Tonight 13 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. Lows near 50. Southwest wind to 10 Mph becoming south after midnight. Gusts to 20 Mph.

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Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F
  • Average September

    59.9 °F
  • Highest 9 September, 2026

    82.4 °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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