Chehalis River - Montesano Weather Forecast

    • 42
    • 52

    Rain Showers

    • 41
    • 57

    Rain Showers Likely

    • 43
    • 64

    Partly Sunny

    • 45
    • 65

    Mostly Cloudy

    • 47
    • 67

    Mostly Cloudy

    • 47
    • 69

    Partly Sunny

Today 15 May Lower Chehalis River Valley

A slight chance of Thunderstorms in the morning. Showers through the day. A chance of Thunderstorms in the afternoon. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Highs in the lower to mid 50s. Southwest wind 10 to 15 Mph with Gusts to 25 Mph.

Tonight 15 May Lower Chehalis River Valley

Showers in the evening. A slight chance of Thunderstorms in the evening. A chance of Showers after midnight. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Lows in the upper 30s to mid 40s. Southwest wind 10 to 15 Mph becoming west after midnight.

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Chehalis River - Montesano Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 7 May, 2026

    48.7 °F

  • Average May

    57.8 °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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