Montesano Weather Forecast

    • 42
    • 68

    Sunny

    • 52
    • 81

    Mostly Sunny

    • 54
    • 87

    Partly Sunny

    • 51
    • 70

    Mostly Cloudy

    • 47
    • 66

    Partly Sunny

    • 46
    • 64

    Chance Rain

Today 31 May Lower Chehalis River Valley

Sunny. Highs in the mid 60s to lower 70s. Northwest wind 10 to 15 Mph.

Tonight 31 May Lower Chehalis River Valley

Clear. Lows in the lower to mid 40s. Northwest wind 10 to 15 Mph in the evening becoming light.

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Montesano Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 17 May, 2026

    38.6 °F

  • Average May

    55.9 °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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