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

46°F

8°C

Humidity 87%
Wind Speed S 4 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 17 Nov 10:00 PM PST
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: A chance of showers before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 43. Light south southeast wind. Chance of precipitation is 40%.

    Low: 43 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 51. Light south wind.

    High: 51 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 53. Light east northeast wind.

    High: 53 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 44. East southeast wind around 5 mph.

    Low: 44 °F

    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before 10am. Partly sunny, with a high near 55.

    High: 55 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Slight Chance
    Showers

  • Friday

    Friday: A chance of showers. Mostly cloudy, with a high near 53.

    High: 53 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly after 10pm. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Showers
    Likely

Detailed Forecast

Tonight
A chance of showers before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 43. Light south southeast wind. Chance of precipitation is 40%.
Tuesday
A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 51. Light south wind.
Tuesday Night
Partly cloudy, with a low around 38. Calm wind.
Wednesday
Partly sunny, with a high near 53. Light east northeast wind.
Wednesday Night
A 30 percent chance of showers, mainly after 10pm. Mostly cloudy, with a low around 44. East southeast wind around 5 mph.
Thursday
A 30 percent chance of showers, mainly before 10am. Partly sunny, with a high near 55.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 42.
Friday
A chance of showers. Mostly cloudy, with a high near 53.
Friday Night
Showers likely, mainly after 10pm. Mostly cloudy, with a low around 46.
Saturday
Showers likely. Mostly cloudy, with a high near 55.
Saturday Night
Showers likely. Mostly cloudy, with a low around 46.
Sunday
Showers likely. Mostly cloudy, with a high near 53.
Sunday Night
Rain likely. Mostly cloudy, with a low around 44.
Monday
Rain likely. Mostly cloudy, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.6°N 122.22°W (Elev. 3 ft)
Last Update:
7:01 pm PST Nov 17, 2025
Forecast Valid:
10pm PST Nov 17, 2025-6pm PST Nov 24, 2025
 
Forecast Discussion
 
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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