Montesano Weather Forecast

    • 52
    • 68

    Gradual Clearing

    • 50
    • 66

    Mostly Cloudy

    • 52
    • 67

    Rain Likely

    • 52
    • 66

    Chance Rain

    • 48
    • 70

    Partly Sunny

    • 52
    • 77

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

Today 10 Sep Lower Chehalis River Valley

Partly sunny. Highs in the 60s to lower 70s. Northwest wind around 10 Mph becoming west in the afternoon. Gusts to 25 Mph.

Tonight 10 Sep Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 50s. West wind 10 to 15 Mph.

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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 5 September, 2026

    71.7 °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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