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.

Clear

54°F

12°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.37 in (1028.45 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 14 Oct 11:35 PM PDT
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Mostly clear, with a low around 49. Light north northeast wind.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 71. Light and variable wind.

    High: 71 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52. Light and variable wind.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 74. Light and variable wind.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of rain after 11pm. Mostly cloudy, with a low around 56. Light south southwest wind becoming south 5 to 10 mph in the evening. Winds could gust as high as 20 mph.

    Low: 56 °F

    Chance Rain

  • Saturday

    Saturday: Rain likely, mainly before 11am. Mostly cloudy, with a high near 63. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Rain Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 49. Light north northeast wind.
Thursday
Sunny, with a high near 71. Light and variable wind.
Thursday Night
Mostly clear, with a low around 52. Light and variable wind.
Friday
Mostly sunny, with a high near 74. Light and variable wind.
Friday Night
A 40 percent chance of rain after 11pm. Mostly cloudy, with a low around 56. Light south southwest wind becoming south 5 to 10 mph in the evening. Winds could gust as high as 20 mph.
Saturday
Rain likely, mainly before 11am. Mostly cloudy, with a high near 63. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
Cloudy, with a high near 58.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Partly sunny, with a high near 61.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.22°W (Elev. 118 ft)
Last Update:
11:26 pm PDT Oct 14, 2026
Forecast Valid:
11pm PDT Oct 14, 2026-6pm PDT Oct 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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