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Cosmopolis, WA - Chehalis River Marine Weather Forecast

Station WPTW1 - 9441102 - Westport, WA

March 3, 2026 3:36 pm PST
Location: 46.904N 124.105W
Atmospheric Pressure: 30.01 in (1016.4 mb)


This Afternoon - 51°F
Mar 03, 2026
17 mph S
Light Rain Likely
Rain likely. Cloudy, with a high near 51. South wind around 17 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Tonight - 47°F
Mar 03, 2026
8 to 17 mph SSW
Showers And Thunderstorms
Rain before 10pm, then showers and thunderstorms between 10pm and 4am, then rain. Cloudy, with a low around 47. South southwest wind 8 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday - 51°F
Mar 04, 2026
8 to 15 mph W
Light Rain
Rain. Mostly cloudy. High near 51, with temperatures falling to around 49 in the afternoon. West wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
Wednesday Night - 44°F
Mar 04, 2026
15 mph WNW
Light Rain
Rain. Cloudy, with a low around 44. West northwest wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
Thursday - 49°F
Mar 05, 2026
10 to 14 mph WNW
Light Rain
Rain. Cloudy, with a high near 49. West northwest wind 10 to 14 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday Night - 46°F
Mar 05, 2026
10 mph WSW
Light Rain
Rain. Cloudy, with a low around 46. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday - 50°F
Mar 06, 2026
8 to 12 mph SW
Light Rain
Rain. Cloudy, with a high near 50.
Friday Night - 48°F
Mar 06, 2026
12 mph SW
Light Rain
Rain. Cloudy, with a low around 48.
Saturday - 51°F
Mar 07, 2026
12 mph WSW
Light Rain
Rain. Cloudy, with a high near 51.
Saturday Night - 48°F
Mar 07, 2026
12 mph WSW
Light Rain
Rain. Cloudy, with a low around 48.
Sunday - 51°F
Mar 08, 2026
9 to 14 mph SW
Light Rain
Rain. Cloudy, with a high near 51.
Sunday Night - 43°F
Mar 08, 2026
15 mph W
Light Rain
Rain. Cloudy, with a low around 43.
Monday - 47°F
Mar 09, 2026
16 mph WNW
Light Rain
Rain. Cloudy, with a high near 47.
Monday Night - 39°F
Mar 09, 2026
13 to 16 mph WNW
Light Rain
Rain before 5am, then rain and snow. Mostly cloudy, with a low around 39.

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