Montesano Weather Forecast

    • 43
    • 67

    Increasing Clouds

    • 53
    • 64

    Rain

    • 46
    • 60

    Rain

    • 47
    • 64

    Partly Sunny

    • 50
    • 67

    Mostly Cloudy

    • 49
    • 66

    Partly Sunny

    • 49
    • 68

    Partly Sunny

Today 27 Sep Lower Chehalis River Valley

Mostly sunny. Highs near 70.

Tonight 27 Sep Lower Chehalis River Valley

Mostly clear. Lows in the 40s. Northwest 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

    46.7 °F

  • Average September

    59.9 °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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