Montesano Weather Forecast

    • 46
    • 60

    Rain

    • 49
    • 65

    Mostly Cloudy

    • 51
    • 66

    Slight Chance Rain

    • 48
    • 66

    Mostly Cloudy

    • 49
    • 70

    Partly Sunny

    • 49
    • 72

    Partly Sunny

Today 29 Sep Lower Chehalis River Valley

Rain until late Afternoon, then cloudy with a chance of rain late in the afternoon. Rainfall Amounts a quarter to a half inch possible. Highs near 60. Southwest wind 10 to 15 Mph.

Tonight 29 Sep Lower Chehalis River Valley

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid to upper 40s. West wind around 10 Mph becoming northwest to 10 Mph after midnight.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 20 September, 2026

    46.7 °F

  • Average September

    59.6 °F

  • Highest 17 September, 2026

    76.6 °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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