Montesano Weather Forecast

    • 55
    • 81

    Becoming Sunny

    • 57
    • 77

    Chance Rain

    • 57
    • 64

    Chance Rain

    • 53
    • 70

    Mostly Cloudy

    • 55
    • 76

    Partly Sunny

    • 53
    • 71

    Mostly Cloudy

Today 20 Aug Lower Chehalis River Valley

Cloudy in the morning then becoming sunny. Highs in the 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 20 Aug Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 50s. Light wind.

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Montesano Temperature Statistics

August Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 3 August, 2026

    49.6 °F

  • Average August

    62.1 °F

  • Highest 4 August, 2026

    79.6 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (14.9 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    58.6 °F
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