I-90 weather conditions near Mercer Island, Washington
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Overcast 55°F 2025-06-20T04:45:00 
Overnight 2025-06-20, Slight Chance Showers. A 20 percent chance of showers. Cloudy, with a steady temperature around 55. Southeast wind around 5 mph.Friday 2025-06-20, Chance Showers then Showers. Showers, with thunderstorms also possible after 5pm. High near 61. South wind around 8 mph becoming northwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night 2025-06-20, Showers Likely then Showers. Showers likely and possibly a thunderstorm, then showers after 2am. Low around 52. East wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday 2025-06-21, Showers then Chance Showers. Showers, mainly before 11am. High near 62. South wind 8 to 10 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night 2025-06-21, Chance Showers. A 30 percent chance of showers. Mostly cloudy, with a low around 53. South wind 5 to 7 mph.
Sunday 2025-06-22, Slight Chance Showers. A 20 percent chance of showers. Partly sunny, with a high near 71.
Sunday Night 2025-06-22, Partly Cloudy. Partly cloudy, with a low around 55.
Monday 2025-06-23, Mostly Sunny. Mostly sunny, with a high near 76.
Monday Night 2025-06-23, Mostly Clear. Mostly clear, with a low around 57.
Tuesday 2025-06-24, Sunny. Sunny, with a high near 81.- Tuesday Night 2025-06-24, Partly Cloudy. Partly cloudy, with a low around 58.
Wednesday 2025-06-25, Partly Sunny. Partly sunny, with a high near 74.
Wednesday Night 2025-06-25, Mostly Cloudy. Mostly cloudy, with a low around 57.
Thursday 2025-06-26, Slight Chance Showers. A slight chance of showers. Partly sunny, with a high near 71.