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Mercer Island, WA Marine Weather Forecast

Today - 54°F
Apr 11, 2025
6 mph NNW
Mostly Sunny
Mostly sunny. High near 54, with temperatures falling to around 52 in the afternoon. North northwest wind around 6 mph.
Tonight - 42°F
Apr 11, 2025
2 to 6 mph WNW
Chance Rain Showers
A chance of rain showers after 10pm. Mostly cloudy. Low around 42, with temperatures rising to around 44 overnight. West northwest wind 2 to 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Saturday - 55°F
Apr 12, 2025
5 mph SSW
Chance Rain Showers then Mostly Sunny
A chance of rain showers before 11am. Mostly sunny, with a high near 55. South southwest wind around 5 mph. Chance of precipitation is 30%.
Saturday Night - 41°F
Apr 12, 2025
5 mph NE
Partly Cloudy
Partly cloudy, with a low around 41. Northeast wind around 5 mph.
Sunday - 59°F
Apr 13, 2025
2 to 9 mph NNE
Mostly Sunny
Mostly sunny, with a high near 59. North northeast wind 2 to 9 mph.
Sunday Night - 45°F
Apr 13, 2025
5 to 9 mph N
Partly Cloudy
Partly cloudy, with a low around 45.
Monday - 63°F
Apr 14, 2025
5 to 8 mph N
Partly Sunny
Partly sunny, with a high near 63.
Monday Night - 47°F
Apr 14, 2025
2 to 8 mph N
Mostly Cloudy
Mostly cloudy, with a low around 47.
Tuesday - 63°F
Apr 15, 2025
2 to 7 mph N
Mostly Sunny
Mostly sunny, with a high near 63.
Tuesday Night - 47°F
Apr 15, 2025
3 to 7 mph NNE
Partly Cloudy
Partly cloudy, with a low around 47.
Wednesday - 64°F
Apr 16, 2025
6 mph WSW
Mostly Sunny
Mostly sunny, with a high near 64.
Wednesday Night - 47°F
Apr 16, 2025
2 to 6 mph N
Mostly Cloudy
Mostly cloudy, with a low around 47.
Thursday - 65°F
Apr 17, 2025
2 to 7 mph N
Partly Sunny
Partly sunny, with a high near 65.
Thursday Night - 49°F
Apr 17, 2025
3 to 7 mph N
Partly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 5am. Partly cloudy, with a low around 49.

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