Montesano Weather Forecast

    • 47
    • 67

    Gradual Clearing

    • 49
    • 77

    Mostly Sunny

    • 52
    • 78

    Mostly Sunny

    • 51
    • 70

    Mostly Cloudy

    • 50
    • 71

    Partly Sunny

    • 51
    • 72

    Partly Sunny

Today 15 Sep Lower Chehalis River Valley

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

Tonight 15 Sep Lower Chehalis River Valley

Mostly clear. Patchy fog in the morning. Lows in the mid 40s to lower 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

    60.7 °F

  • Highest 9 September, 2026

    73.7 °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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