Montesano Weather Forecast

    • 51
    • 67

    Decreasing Clouds

    • 54
    • 76

    Mostly Cloudy

    • 55
    • 66

    Rain Likely

    • 52
    • 61

    Rain Showers

    • 50
    • 63

    Rain Showers

    • 50
    • 66

    Chance Rain

Today 30 Aug Lower Chehalis River Valley

Partly sunny. Highs in the 60s to lower 70s. Light wind becoming west around 10 Mph in the afternoon.

Tonight 30 Aug Lower Chehalis River Valley

Partly cloudy in the evening then becoming mostly cloudy. Lows near 50. West 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

    62.6 °F

  • Highest 24 August, 2026

    82.7 °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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