Montesano Weather Forecast

    • 49
    • 74

    Increasing Clouds

    • 47
    • 66

    Mostly Cloudy

    • 47
    • 76

    Partly Sunny

    • 50
    • 77

    Slight Chance Rain

    • 49
    • 73

    Mostly Cloudy

    • 48
    • 67

    Chance Rain

Today 9 May Lower Chehalis River Valley

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

Tonight 9 May Lower Chehalis River Valley

Mostly cloudy. Lows near 50. West wind around 10 Mph in the evening becoming light.

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Montesano Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 1 May, 2026

    49.6 °F

  • Average May

    58 °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

    52.3 °F

  • Average High 2021–2026

    58.6 °F
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