Montesano Weather Forecast

    • 54
    • 64

    Rain Likely

    • 49
    • 66

    Mostly Cloudy

    • 48
    • 72

    Partly Sunny

    • 52
    • 79

    Mostly Sunny

    • 53
    • 82

    Mostly Sunny

    • 53
    • 80

    Partly Sunny

Today 13 Sep Lower Chehalis River Valley

Mostly cloudy. Rain likely in the Morning, then a chance of rain late in the morning. A slight chance of rain early in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs in the 60s. West wind around 10 Mph becoming southwest in the afternoon.

Tonight 13 Sep Lower Chehalis River Valley

Mostly cloudy. A slight chance of rain in the evening. Lows in the 50s. Southwest wind around 10 Mph with Gusts to 20 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

    60.9 °F

  • Highest 9 September, 2026

    72 °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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