Montesano Weather Forecast

    • 50
    • 71

    Increasing Clouds

    • 46
    • 68

    Mostly Cloudy

    • 48
    • 68

    Rain

    • 45
    • 57

    Rain Showers

    • 47
    • 64

    Chance Rain

    • 47
    • 63

    Mostly Cloudy

Today 22 May Lower Chehalis River Valley

Partly sunny in the morning then becoming mostly sunny. Highs in the upper 60s to mid 70s. West wind to 10 Mph with Gusts to 20 Mph in the morning becoming Light, then becoming west 10 to 15 Mph in the afternoon.

Tonight 22 May Lower Chehalis River Valley

Mostly cloudy. Lows near 50. West wind 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Montesano Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 17 May, 2026

    38.6 °F

  • Average May

    56.1 °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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