Cosmopolis, WA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Cosmopolis, WA in one place.
Sunny, with a high near 71. East wind around 8 mph.
Local Weather Overview
This forecast page for Cosmopolis, WA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 13, 2026 8:44 PM PDT.
The active forecast window currently covers Oct 15 to Oct 20, 2026 for Cosmopolis, WA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 13, 2026 8:44 PM PDT
- Forecast office
- SEW
- Source
- NOAA / NWS
Daily Outlook
This Week in Cosmopolis
Thursday looks like the warmest upcoming period in Cosmopolis at 71 degrees F.
Saturday Night is the coolest period ahead with temperatures near 43 degrees F.
The strongest winds are forecast for Thursday Night at about 6 to 9 mph E.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 13, 2026 8:44 PM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SEW
- Radar station
- KLGX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 51. East wind 6 to 9 mph.
Mostly sunny, with a high near 68.
Rain likely after 11pm. Mostly cloudy, with a low around 53.
A chance of rain before 11am. Partly sunny, with a high near 59.
Partly cloudy, with a low around 43.
A chance of rain after 5pm. Mostly cloudy, with a high near 58.
Rain. Cloudy, with a low around 48.
Rain. Mostly cloudy, with a high near 54.
A chance of rain. Mostly cloudy, with a low around 45.
A slight chance of rain before 11am. Partly sunny, with a high near 57.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Sunny
|
71°F |
8 mph
E
|
|
Thursday Night
Oct 15
|
Mostly Clear
|
51°F |
6 to 9 mph
E
|
|
Friday
Oct 16
|
Mostly Sunny
|
68°F |
2 to 6 mph
SSE
|
|
Friday Night
Oct 16
|
Light Rain Likely
|
53°F |
2 to 7 mph
SW
|
|
Saturday
Oct 17
|
Chance Light Rain then Partly Sunny
|
59°F |
7 mph
W
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
43°F |
1 to 6 mph
NNE
|
|
Sunday
Oct 18
|
Mostly Cloudy then Chance Light Rain
|
58°F |
5 mph
SE
|
|
Sunday Night
Oct 18
|
Light Rain
|
48°F |
3 to 7 mph
S
|
|
Monday
Oct 19
|
Light Rain
|
54°F |
7 mph
SSW
|
|
Monday Night
Oct 19
|
Chance Light Rain
|
45°F |
6 mph
SSE
|
|
Tuesday
Oct 20
|
Slight Chance Light Rain then Partly Sunny
|
57°F |
5 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Cosmopolis.