Montesano Weather Forecast

    • 51
    • 67

    Increasing Clouds

    • 52
    • 76

    Mostly Sunny

    • 56
    • 79

    Partly Sunny

    • 51
    • 67

    Partly Sunny

    • 50
    • 65

    Slight Chance Rain

    • 51
    • 68

    Chance Rain

    • 51
    • 71

    Partly Sunny

Today 7 Sep Lower Chehalis River Valley

Mostly cloudy. Highs in the 60s. Light wind becoming west around 10 Mph in the afternoon.

Tonight 7 Sep Lower Chehalis River Valley

Partly cloudy until early morning then becoming mostly cloudy. Lows near 50. Light wind.

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  • Temperature Real-Time

Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 4 September, 2026

    49.6 °F

  • Average September

    60.9 °F

  • Highest 4 September, 2026

    70.6 °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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