Cosmopolis Weather Forecast

    • 33
    • 44

    Mostly Cloudy

    • 34
    • 44

    Mostly Cloudy

    • 34
    • 47

    Mostly Cloudy

    • 36
    • 47

    Mostly Cloudy

    • 39
    • 48

    Chance Rain

    • 40
    • 49

    Rain

Today 27 Dec Lower Chehalis River Valley

Mostly sunny. Highs in the lower to mid 40s. Northwest wind 10 to 15 Mph with Gusts to 25 Mph in the morning becoming light.

Tonight 27 Dec Lower Chehalis River Valley

Mostly cloudy. Lows in the upper 20s to mid 30s. Light wind.

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Cosmopolis Temperature Statistics

December Temperature

Hoquiam, Bowerman Airport (6.8 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    47.8 °F

  • Highest 15 December, 2025

    57 °F

Climate (2020–Present)

Hoquiam, Bowerman Airport (6.8 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    58.4 °F
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