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Cosmopolis, WA Weather Forecast
Cosmopolis, WA Weather Forecast Date: 236 AM PDT Wed Oct 21 2026
The area/counties/county of: Lower Chehalis River Valley, including the cities of: Hoquiam and Aberdeen.or toggle through each period.
Today... Sunny. Highs in the 60s. East wind to 10 mph becoming west in the afternoon.
Tonight... Mostly cloudy. Lows in the upper 30s to mid 40s. West wind to 10 mph in the evening becoming light.
Thursday... Mostly cloudy. Highs near 60. Light wind becoming northwest 10 to 15 mph in the afternoon.
Thursday Night... Mostly clear. Lows in the 30s to lower 40s. Northwest wind 10 to 15 mph with gusts to 25 mph.
Friday... Sunny. Highs in the mid to upper 50s. Northwest wind to 10 mph in the morning becoming light.
Friday Night... Partly cloudy. Lows in the mid 30s to lower 40s.
Saturday... Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Highs in the mid to upper 50s.
Saturday Night... Mostly cloudy with a chance of rain. Lows near 40.
Sunday... Mostly cloudy with a chance of rain. Highs in the mid to upper 50s.
Sunday Night... Mostly cloudy with a slight chance of rain. Lows near 40.
Monday... Partly sunny with a slight chance of rain. Highs in the mid to upper 50s.
Monday Night... Partly cloudy. Lows near 40.
POP = Probability of Precipitation
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