Cosmopolis Weather Forecast

    • 30
    • 48

    Rain

    • 34
    • 52

    Mostly Sunny

    • 39
    • 56

    Rain

    • 38
    • 49

    Rain

    • 37
    • 52

    Rain Likely

    • 38
    • 55

    Chance Rain

Today 29 Mar Lower Chehalis River Valley

Rain likely in the Morning, then rain at Times in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs near 50. Light wind becoming west 10 to 15 Mph in the afternoon.

Tonight 29 Mar Lower Chehalis River Valley

Partly cloudy. Lows in the upper 20s to mid 30s. Northwest wind 10 to 15 Mph with Gusts to 25 Mph decreasing to 10 Mph or less after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cosmopolis Temperature Statistics

March Temperature

Hoquiam, Bowerman Airport (6.8 miles)

  • Lowest 26 March, 2026

    32 °F

  • Average March

    46.2 °F

  • Highest 1 March, 2026

    59.6 °F

Climate (2021–Present)

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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