Montesano Weather Forecast

    • 48
    • 71

    Increasing Clouds

    • 48
    • 73

    Partly Sunny

    • 48
    • 72

    Mostly Cloudy

    • 47
    • 69

    Mostly Cloudy

    • 47
    • 67

    Mostly Cloudy

    • 47
    • 66

    Mostly Cloudy

Today 19 Sep Lower Chehalis River Valley

Mostly cloudy until late afternoon then becoming mostly sunny. Areas of fog in the morning. Highs in the mid 60s to lower 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 19 Sep Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 40s to lower 50s. West wind to 10 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    60.8 °F

  • Highest 17 September, 2026

    75.9 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (14.9 miles)

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

  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.6 °F
Get WillyWeather+ to remove ads