Montesano Weather Forecast

    • 47
    • 64

    Mostly Cloudy

    • 46
    • 69

    Partly Sunny

    • 50
    • 75

    Partly Sunny

    • 49
    • 71

    Mostly Cloudy

    • 46
    • 69

    Mostly Cloudy

    • 46
    • 64

    Chance Rain

Today 19 May Lower Chehalis River Valley

Mostly cloudy. Highs in the 60s. Light wind becoming west 10 to 15 Mph in the afternoon.

Tonight 19 May Lower Chehalis River Valley

Mostly cloudy. Lows in the mid to upper 40s. West wind 10 to 15 Mph decreasing to 10 Mph or less after midnight.

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Montesano Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 16 May, 2026

    45 °F

  • Average May

    56.6 °F

  • Highest 3 May, 2026

    82.7 °F

Climate (2021–Present)

Hoquiam, Bowerman Airport (14.9 miles)

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  • Average Low 2021–2026

    46.4 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.7 °F
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