Cosmopolis Weather Forecast

    • 55
    • 69

    Increasing Clouds

    • 56
    • 72

    Becoming Sunny

    • 56
    • 68

    Mostly Cloudy

    • 54
    • 69

    Mostly Cloudy

    • 55
    • 72

    Mostly Cloudy

    • 56
    • 71

    Mostly Cloudy

    • 56
    • 69

    Mostly Cloudy

Today 12 Aug Lower Chehalis River Valley

Cloudy in the morning then becoming mostly sunny. Areas of drizzle in the morning. Highs in the upper 60s to mid 70s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 12 Aug Lower Chehalis River Valley

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 50s. West wind to 10 Mph in the evening becoming light.

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Cosmopolis Temperature Statistics

August Temperature

Hoquiam, Bowerman Airport (6.8 miles)

  • Lowest 3 August, 2026

    49.6 °F

  • Average August

    62.8 °F

  • Highest 4 August, 2026

    79.6 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (6.8 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    58.6 °F
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