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Cosmopolis Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Partly Sunny | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Mostly Sunny | Partly Cloudy | Partly Sunny | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Cloudy |
| Hi: 66°FHi: 19°C | Lo: 50°FLo: 10°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 70°FHi: 21°C | Lo: 53°FLo: 12°C | Hi: 67°FHi: 19°C | Lo: 53°FLo: 12°C | Hi: 70°FHi: 21°C | Lo: 53°FLo: 12°C | Hi: 75°FHi: 24°C | Lo: 57°FLo: 14°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 236 AM PDT Fri Sep 04 2026 
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Issued: 854 AM PDT Fri Sep 4 2026
Aviation
... Variable flow aloft this morning as upper level low moves very slowly over W WA. Surface winds at most terminals also light and variable with speeds less than 5 kts. Direction will shift to west or northwesterly this afternoon. Terminals on the east side of the Sound will see winds turn again more northerly in the evening. Speeds for all terminals will increase some, generally ranging 4-8 kts to finish the TAF period.
Widespread VFR conditions this early morning. Cigs may lower a litt...