Montesano Weather Forecast

    • 48
    • 61

    Rain Showers

    • 49
    • 70

    Slight Chance Rain

    • 50
    • 70

    Mostly Cloudy

    • 53
    • 74

    Partly Sunny

    • 54
    • 68

    Mostly Cloudy

    • 53
    • 71

    Partly Sunny

Today 3 Sep Lower Chehalis River Valley

Showers and a slight chance of Thunderstorms in the Morning, then Showers and a chance of Thunderstorms in the afternoon. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Highs near 60. Southeast wind around 10 Mph in the morning becoming light.

Tonight 3 Sep Lower Chehalis River Valley

Partly cloudy. A chance of Showers in the evening. 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 1 September, 2026

    60.1 °F

  • Average September

    61.8 °F

  • Highest 1 September, 2026

    64 °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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