Chehalis Weather Forecast

    • 51
    • 68

    Increasing Clouds

    • 46
    • 61

    Rain Likely

    • 46
    • 66

    Partly Sunny

    • 50
    • 69

    Mostly Cloudy

    • 48
    • 68

    Partly Sunny

    • 48
    • 70

    Partly Sunny

    • 48
    • 73

    Partly Sunny

Today 28 Sep Lowlands of Lewis and Southern Thurston Counties

Partly sunny. Highs near 70.

Tonight 28 Sep Lowlands of Lewis and Southern Thurston Counties

Mostly cloudy. A slight chance of rain late in the night. Lows near 50. Southwest wind to 10 Mph becoming south with Gusts to 30 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Chehalis Temperature Statistics

September Temperature

Chehalis-Centralia Airport (1.2 miles)

  • Lowest 23 September, 2026

    44.6 °F

  • Average September

    58.4 °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