National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Boeing Field - King County International Airport (KBFI)

Lat: 47.54548°NLon: 122.3147°WElev: 20.0ft.

Overcast

51°F

11°C

Humidity 92%
Wind Speed SE 8 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 14 Nov 09:53 PM PST
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Rain. Low around 52. South wind around 11 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 52 °F

    Rain

  • Saturday

    Saturday: Rain likely, mainly after 2pm. Cloudy, with a high near 58. South wind 7 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 58 °F

    Rain Likely

  • Saturday Night

    Saturday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 52. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 52 °F

    Rain Likely

  • Sunday

    Sunday: Rain, mainly after 10am. High near 57. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 57 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Low around 51. South wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Rain

  • Monday

    Monday: Rain likely, mainly before 10am. Mostly cloudy, with a high near 57. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 57 °F

    Rain Likely

  • Monday Night

    Monday Night: A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

  • Tuesday

    Tuesday: A chance of rain, mainly before 4pm. Partly sunny, with a high near 53.

    High: 53 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A slight chance of rain before 10pm, then a slight chance of rain after 4am. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Slight Chance
    Rain

Detailed Forecast

Tonight
Rain. Low around 52. South wind around 11 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain likely, mainly after 2pm. Cloudy, with a high near 58. South wind 7 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 52. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Rain, mainly after 10am. High near 57. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Rain. Low around 51. South wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Rain likely, mainly before 10am. Mostly cloudy, with a high near 57. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A 40 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 46.
Tuesday
A chance of rain, mainly before 4pm. Partly sunny, with a high near 53.
Tuesday Night
A slight chance of rain before 10pm, then a slight chance of rain after 4am. Mostly cloudy, with a low around 41.
Wednesday
A chance of rain, mainly after 10am. Mostly cloudy, with a high near 52.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 45.
Thursday
A chance of rain. Mostly cloudy, with a high near 52.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 42.
Friday
A chance of rain. Mostly cloudy, with a high near 53.
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.6°N 122.22°W (Elev. 3 ft)
Last Update:
7:01 pm PST Nov 14, 2025
Forecast Valid:
10pm PST Nov 14, 2025-6pm PST Nov 21, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation