Montesano Weather Forecast

    • 50
    • 71

    Chance Rain Showers

    • 53
    • 71

    Partly Sunny

    • 52
    • 65

    Mostly Cloudy

    • 53
    • 73

    Partly Sunny

    • 56
    • 80

    Partly Sunny

    • 54
    • 73

    Mostly Cloudy

Today 5 Sep Lower Chehalis River Valley

Mostly cloudy. A slight chance of Thunderstorms late in the afternoon. Highs in the upper 60s to mid 70s. Light wind becoming east to 10 Mph in the afternoon.

Tonight 5 Sep Lower Chehalis River Valley

Mostly cloudy with a slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows near 50. 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 3 September, 2026

    54 °F

  • Average September

    61.4 °F

  • Highest 1 September, 2026

    66.7 °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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