Montesano Weather Forecast

    • 49
    • 67

    Increasing Clouds

    • 46
    • 65

    Mostly Cloudy

    • 49
    • 61

    Rain

    • 45
    • 61

    Chance Rain

    • 45
    • 63

    Mostly Cloudy

    • 46
    • 64

    Chance Rain

    • 48
    • 63

    Chance Rain

Today 22 Sep Lower Chehalis River Valley

Mostly cloudy with a chance of rain. Highs in the lower to mid 60s.

Tonight 22 Sep Lower Chehalis River Valley

Mostly cloudy. A slight chance of rain late in the night. Lows in the mid 40s to lower 50s. West wind to 10 Mph in the evening becoming light.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 20 September, 2026

    46.9 °F

  • Average September

    60.6 °F

  • Highest 17 September, 2026

    76.6 °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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