Montesano Weather Forecast

    • 57
    • 85

    Patchy Smoke

    • 57
    • 75

    Mostly Cloudy

    • 56
    • 70

    Mostly Cloudy

    • 54
    • 68

    Chance Rain Showers

    • 53
    • 68

    Mostly Cloudy

    • 50
    • 67

    Slight Chance Rain

Today 24 Aug Lower Chehalis River Valley

Sunny. Highs in the upper 70s to mid 80s. Light wind becoming northeast to 10 Mph in the afternoon.

Tonight 24 Aug Lower Chehalis River Valley

Partly cloudy. Patchy smoke after midnight. Lows in the upper 50s. North wind to 10 Mph in the evening becoming light.

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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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