Chehalis Weather Forecast

    • 44
    • 67

    Gradual Clearing

    • 49
    • 62

    Rain

    • 43
    • 61

    Rain

    • 42
    • 63

    Mostly Cloudy

    • 42
    • 65

    Partly Sunny

    • 45
    • 65

    Mostly Cloudy

Today 23 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy until late afternoon then becoming mostly sunny. Highs in the mid to upper 60s. Light wind.

Tonight 23 Sep Lowlands of Lewis and Southern Thurston Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 40s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 5 September, 2026

    46.4 °F

  • Average September

    59 °F

  • Highest 9 September, 2026

    82.4 °F

Climate (2021–2026)

Chehalis-Centralia Airport (1.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    61.3 °F
Get WillyWeather+ to remove ads