Montesano Weather Forecast

    • 45
    • 65

    Mostly Cloudy

    • 51
    • 60

    Rain

    • 44
    • 60

    Rain Showers

    • 44
    • 63

    Mostly Cloudy

    • 46
    • 64

    Partly Sunny

    • 48
    • 63

    Chance Rain

    • 49
    • 64

    Chance Rain

Today 23 Sep Lower Chehalis River Valley

Mostly cloudy with a slight chance of rain. Highs in the lower to mid 60s.

Tonight 23 Sep Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 40s. 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 20 September, 2026

    46.7 °F

  • Average September

    60.5 °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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