Montesano Weather Forecast

    • 56
    • 79

    Increasing Clouds

    • 52
    • 68

    Increasing Clouds

    • 51
    • 66

    Mostly Cloudy

    • 52
    • 66

    Chance Rain

    • 51
    • 68

    Partly Sunny

    • 50
    • 70

    Partly Sunny

    • 51
    • 72

    Partly Sunny

Today 9 Sep Lower Chehalis River Valley

Mostly sunny. Highs in the mid 70s to lower 80s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 9 Sep Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 50s to lower 60s. West wind to 10 Mph. Gusts to 25 Mph after midnight.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 4 September, 2026

    49.6 °F

  • Average September

    61.1 °F

  • Highest 5 September, 2026

    71.7 °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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