Montesano Weather Forecast

    • 41
    • 67

    Becoming Sunny

    • 40
    • 69

    Partly Sunny

    • 40
    • 60

    Mostly Cloudy

    • 38
    • 58

    Partly Sunny

    • 40
    • 55

    Rain Likely

    • 40
    • 58

    Chance Rain

Today 20 Oct Lower Chehalis River Valley

Sunny. Patchy fog and frost in the morning. Highs in the 60s to lower 70s. Light wind becoming northeast to 10 Mph in the afternoon.

Tonight 20 Oct Lower Chehalis River Valley

Mostly clear. Lows in the upper 30s to mid 40s. Light wind.

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Montesano Temperature Statistics

October Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 12 October, 2026

    37.7 °F

  • Average October

    56.6 °F

  • Highest 3 October, 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

    58.7 °F
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