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Cosmopolis, WA Weather Forecast
Cosmopolis, WA Weather Forecast Dated: 649 PM Thu Sep 03 2026
Expect a cool pattern with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Thursday, September 3, 2026
Mid-Morning
55°F 13°C
Heavy Rain
Mid-Afternoon
57°F 14°C
Heavy Rain
Early-Evening
57°F 14°C
Heavy Rain
Brisk around 57°F 14°C, rounds of showers expected off and on all day, with steady humidity and steady pressure.
Friday, September 4, 2026
Mid-Morning
53°F 12°C
Cloudy
Mid-Afternoon
70°F 21°C
Overcast
Early-Evening
58°F 15°C
Overcast
Comfortable with temperatures reaching 70°F 21°C, cloudy in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Saturday, September 5, 2026
Mid-Morning
58°F 14°C
Overcast
Mid-Afternoon
65°F 19°C
Light Showers
Early-Evening
57°F 14°C
Light Showers
Comfortable at 65°F 19°C, dry early, with showers continuing through afternoon and evening, with increasing humidity and steady pressure.
Sunday, September 6, 2026
Mid-Morning
55°F 13°C
Cloudy
Mid-Afternoon
65°F 18°C
Overcast
Early-Evening
60°F 16°C
Cloudy
Cool with a high near 65°F 18°C, overcast through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.
Monday, September 7, 2026
Mid-Morning
58°F 14°C
Sunny
Mid-Afternoon
71°F 21°C
Sunny
Early-Evening
60°F 15°C
Sunny
Mild with a high of 71°F 21°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the SSE to the W at 8 mph 12 km/h.
Tuesday, September 8, 2026
Mid-Morning
57°F 14°C
Overcast
Mid-Afternoon
71°F 22°C
Overcast
Early-Evening
61°F 16°C
Overcast
Pleasant near 71°F 22°C, overcast throughout the day, with steady humidity and steady pressure.
Wednesday, September 9, 2026
Mid-Morning
60°F 15°C
Sunny
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
62°F 17°C
Sunny
Comfortable with temperatures reaching 77°F 25°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.
Thursday, September 10, 2026
Mid-Morning
58°F 15°C
Scattered Showers
Mid-Afternoon
63°F 17°C
Scattered Showers
Early-Evening
59°F 16°C
Scattered Showers
Cool with a high near 63°F 17°C, scattered downpours possible, with steady humidity and steady pressure. Winds switching from the SW to the WSW at 7 mph 11 km/h.
Friday, September 11, 2026
Mid-Morning
57°F 14°C
Scattered Showers
Mid-Afternoon
64°F 18°C
Scattered Showers
Early-Evening
54°F 13°C
Sunny
Refreshing around 64°F 18°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds moving from the WSW to the SSW at 4 mph 7 km/h.
Saturday, September 12, 2026
Mid-Morning
53°F 12°C
Scattered Showers
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
55°F 13°C
Light Fog
Mildly cool near 64°F 18°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
53°F 12°C
Scattered Showers
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
58°F 15°C
Cloudy
Comfortable at 66°F 19°C, scattered downpours possible, with steady humidity and steady pressure.
Monday, September 14, 2026
Mid-Morning
56°F 13°C
Overcast
Mid-Afternoon
64°F 18°C
Overcast
Early-Evening
57°F 14°C
Sunny
Cool with a high near 64°F 18°C, overcast through the afternoon, turning cloudy this evening, with steady humidity and steady pressure.
Tuesday, September 15, 2026
Mid-Morning
57°F 14°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
62°F 16°C
Sunny
Enjoyable around 74°F 23°C, sunny throughout the day, with steady humidity and steady pressure.
Wednesday, September 16, 2026
Mid-Morning
59°F 15°C
Sunny
Mid-Afternoon
74°F 24°C
Sunny
Early-Evening
61°F 16°C
Sunny
Mild temperatures up to 74°F 24°C, sunny throughout the day, with steady humidity and steady pressure.
Cosmopolis, WA Weather Radar Map
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