Cosmopolis Weather Forecast

    • 49
    • 59

    Chance Rain

    • 46
    • 58

    Rain Likely

    • 43
    • 54

    Rain Showers

    • 42
    • 57

    Chance Rain Showers

    • 43
    • 58

    Mostly Cloudy

    • 47
    • 61

    Chance Rain

    • 45
    • 64

    Partly Sunny

Today 13 May Lower Chehalis River Valley

Showers in the Morning, then Showers likely in the late morning and early afternoon. A chance of Showers late in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs near 60. West wind to 10 Mph increasing to 10 to 15 Mph in the afternoon. Gusts to 25 Mph.

Tonight 13 May Lower Chehalis River Valley

Mostly cloudy. A chance of Showers in the Evening, then a slight chance of Showers after midnight. Lows in the mid 40s to lower 50s. West wind 10 to 15 Mph decreasing to 10 Mph or less after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Cosmopolis Temperature Statistics

May Temperature

Hoquiam, Bowerman Airport (6.8 miles)

  • Lowest 7 May, 2026

    48.7 °F

  • Average May

    57.6 °F

  • Highest 3 May, 2026

    82.7 °F

Climate (2021–Present)

Hoquiam, Bowerman Airport (6.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    46.4 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    58.6 °F
Get WillyWeather+ to remove ads