Montesano Weather Forecast

    • 49
    • 68

    Increasing Clouds

    • 49
    • 70

    Mostly Cloudy

    • 49
    • 73

    Partly Sunny

    • 50
    • 70

    Mostly Cloudy

    • 48
    • 68

    Mostly Cloudy

    • 50
    • 68

    Mostly Cloudy

Today 18 Sep Lower Chehalis River Valley

Mostly cloudy. Highs in the mid 60s to lower 70s. Southwest wind to 10 Mph.

Tonight 18 Sep Lower Chehalis River Valley

Mostly cloudy. Lows in the upper 40s to mid 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 8 September, 2026

    48.7 °F

  • Average September

    60.7 °F

  • Highest 9 September, 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

    58.6 °F
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