Montesano Weather Forecast

    • 49
    • 65

    Mostly Cloudy

    • 51
    • 67

    Mostly Cloudy

    • 48
    • 70

    Partly Sunny

    • 49
    • 73

    Partly Sunny

    • 51
    • 74

    Partly Sunny

    • 51
    • 67

    Mostly Cloudy

Today 30 Sep Lower Chehalis River Valley

Partly sunny in the morning then becoming sunny. Patchy fog in the morning. Highs in the 60s. Light wind.

Tonight 30 Sep Lower Chehalis River Valley

Mostly cloudy. Lows in the mid 40s to lower 50s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 27 September, 2026

    44.1 °F

  • Average September

    59.5 °F

  • Highest 17 September, 2026

    76.6 °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