Montesano Weather Forecast

    • 51
    • 66

    Cloudy

    • 53
    • 69

    Rain

    • 54
    • 66

    Chance Rain

    • 47
    • 68

    Mostly Cloudy

    • 49
    • 74

    Mostly Sunny

    • 52
    • 81

    Mostly Sunny

    • 53
    • 82

    Partly Sunny

Today 11 Sep Lower Chehalis River Valley

Mostly cloudy. Highs in the 60s. Light wind.

Tonight 11 Sep Lower Chehalis River Valley

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

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    61 °F

  • Highest 9 September, 2026

    72 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (14.9 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.6 °F
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