Montesano Weather Forecast

    • 45
    • 59

    Slight Chance Rain

    • 42
    • 63

    Mostly Cloudy

    • 43
    • 66

    Partly Sunny

    • 51
    • 64

    Chance Rain

    • 49
    • 61

    Chance Rain

    • 48
    • 63

    Chance Rain

    • 45
    • 61

    Mostly Cloudy

Today 25 Sep Lower Chehalis River Valley

Mostly sunny. Highs in the lower to mid 60s.

Tonight 25 Sep Lower Chehalis River Valley

Partly cloudy with a slight chance of rain in the Evening, then partly cloudy after midnight. Lows in the 40s. West wind 10 to 20 Mph decreasing to 10 Mph or less after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 20 September, 2026

    46.7 °F

  • Average September

    60.3 °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