Montesano Weather Forecast

    • 51
    • 70

    Increasing Clouds

    • 48
    • 67

    Mostly Cloudy

    • 47
    • 65

    Mostly Cloudy

    • 48
    • 60

    Rain Likely

    • 45
    • 61

    Slight Chance Rain

    • 45
    • 64

    Mostly Cloudy

    • 47
    • 63

    Chance Rain

Today 21 Sep Lower Chehalis River Valley

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

Tonight 21 Sep Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 50s. West wind around 10 Mph.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    60.9 °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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