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Weather Forecast for Mercer Island, Washington

Traveling to Mercer Island, Washington? Here is your 6-day weather forecast in the area. Whether it is a warm weather destinations or cold climate don’t forget to consider weather, while you pack your bags for this trip. Start your day when the sunrises at 1:49 PM and don’t miss the sunset at 2:13 AM. Today’s winds are traveling south-southeast at a speed of 10 MPH. The temperature feels like 66 with a humidity level of 68. Cloud coverage is 27 percent with 14.9 percent visibility. Today’s UV index is 0 make sure to prepare properly. Make sure to plan your travel itinerary to match your travel weather forecast to make the most of your vacation with Reservations.com.


Fahrenheit / Celsius
Thursday 9/18
Scattered clouds

Thursday 9/18 Weather forecast for Mercer Island, Washington, Scattered clouds
66°F
High: 67°F
Low: 57°F
Precipitation: 0%
Today 9/19
Few clouds

Friday 9/19 Weather forecast for Mercer Island, Washington, Few clouds
64°F
High: 72°F
Low: 56°F
Precipitation: 0%
Saturday 9/20
Light rain

Saturday 9/20 Weather forecast for Mercer Island, Washington, Light rain
63°F
High: 70°F
Low: 60°F
Precipitation: 40%
Sunday 9/21
Light rain

Sunday 9/21 Weather forecast for Mercer Island, Washington, Light rain
63°F
High: 67°F
Low: 55°F
Precipitation: 80%
Monday 9/22
Scattered clouds

Monday 9/22 Weather forecast for Mercer Island, Washington, Scattered clouds
61°F
High: 69°F
Low: 56°F
Precipitation: 0%
Tuesday 9/23
Scattered clouds

Tuesday 9/23 Weather forecast for Mercer Island, Washington, Scattered clouds
63°F
High: 72°F
Low: 59°F
Precipitation: 0%

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