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.

Mostly Cloudy

63°F

17°C

Humidity 63%
Wind Speed N 0 MPH
Barometer 30.14 in (1020.66 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 03 Oct 07:35 PM PDT
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Rain likely before 3am, then a chance of rain after 5am. Mostly cloudy, with a low around 55. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 55 °F

    Rain Likely

  • Saturday

    Saturday: A 50 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 65. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 65 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain before 11pm. Partly cloudy, with a low around 50. Calm wind becoming north around 5 mph after midnight.

    Low: 50 °F

    Chance Rain
    then Partly
    Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 67. North northeast wind 5 to 7 mph.

    High: 67 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48. Northeast wind 3 to 7 mph.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 49.

    Low: 49 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
Rain likely before 3am, then a chance of rain after 5am. Mostly cloudy, with a low around 55. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 50 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 65. Calm wind becoming north northwest around 5 mph in the afternoon.
Saturday Night
A 30 percent chance of rain before 11pm. Partly cloudy, with a low around 50. Calm wind becoming north around 5 mph after midnight.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 67. North northeast wind 5 to 7 mph.
Sunday Night
Mostly clear, with a low around 48. Northeast wind 3 to 7 mph.
Monday
Sunny, with a high near 70.
Monday Night
Clear, with a low around 49.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 51.
Wednesday
A chance of rain, mainly after 11am. Mostly sunny, with a high near 68.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 51.
Thursday
A chance of rain. Partly sunny, with a high near 67.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 51.
Friday
A chance of rain. Partly sunny, with a high near 66.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.6°N 122.22°W (Elev. 3 ft)
Last Update:
2:25 pm PDT Oct 3, 2025
Forecast Valid:
7pm PDT Oct 3, 2025-6pm PDT Oct 10, 2025
 
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