Weather WorldCosmopolis, WA 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Cosmopolis, WA Weather Forecast
Cosmopolis, WA Weather Forecast Date: 236 PM PDT Thu Sep 03 2026
The area/counties/county of: Lower Chehalis River Valley, including the cities of: Hoquiam and Aberdeen.or toggle through each period.
Tonight... Mostly cloudy then becoming partly cloudy after midnight then becoming mostly cloudy. A chance of rain in the evening. Lows near 50. Light wind.
Friday... Partly sunny. Highs in the mid 60s to lower 70s. Light wind.
Friday Night... Mostly cloudy. Lows near 50. Light wind.
Saturday... Partly sunny. A slight chance of rain in the afternoon. Highs in the upper 60s to mid 70s. Light wind.
Saturday Night... Mostly cloudy. Lows near 50. Light wind.
Sunday... Mostly sunny. Highs in the lower to mid 70s.
Sunday Night... Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 50s.
Labor Day... Partly sunny with a slight chance of rain. Highs in the mid to upper 60s.
Monday Night... Mostly cloudy. A slight chance of rain after midnight. Lows in the mid 50s.
Tuesday... Mostly cloudy. Highs near 70.
Tuesday Night... Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 50s.
Wednesday... Mostly sunny. Highs in the 70s.
Wednesday Night... Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid to upper 50s.
POP = Probability of Precipitation
Cosmopolis Radar Loop
Use the map search tool if you want to place a location marker on the radar map...