Montesano Weather Forecast

    • 54
    • 71

    Increasing Clouds

    • 51
    • 67

    Mostly Cloudy

    • 52
    • 75

    Mostly Sunny

    • 55
    • 80

    Mostly Sunny

    • 52
    • 69

    Mostly Cloudy

    • 51
    • 66

    Mostly Cloudy

    • 52
    • 70

    Partly Sunny

Today 6 Sep Lower Chehalis River Valley

Sunny. Highs in the upper 60s to mid 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 6 Sep Lower Chehalis River Valley

Mostly clear in the evening then becoming mostly cloudy. Lows in the 50s. West wind around 10 Mph.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 4 September, 2026

    50 °F

  • Average September

    60.8 °F

  • Highest 4 September, 2026

    69.1 °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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