Montesano Weather Forecast

    • 49
    • 65

    Increasing Clouds

    • 48
    • 68

    Partly Sunny

    • 50
    • 78

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

    • 51
    • 72

    Mostly Cloudy

Today 14 Sep Lower Chehalis River Valley

Mostly cloudy. Highs in the 60s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 14 Sep Lower Chehalis River Valley

Mostly cloudy. Lows in the mid 40s to lower 50s. Light wind.

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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 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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