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

39°F

4°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 29.58 in (1001.69 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 25 Dec 06:35 AM PST
Extended Forecast for

Mercer Island WA

  • Christmas Day

    Christmas Day: A 50 percent chance of showers. Mostly cloudy, with a high near 46. North wind 6 to 8 mph.

    High: 46 °F

    Chance
    Showers

  • Tonight

    Tonight: A 50 percent chance of showers. Mostly cloudy, with a steady temperature around 44. South wind 6 to 8 mph.

    Low: 44 °F

    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a steady temperature around 43. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 43 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 36. South southwest wind 7 to 10 mph.

    Low: 36 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers. Partly sunny, with a high near 42. South southeast wind around 5 mph becoming north northwest in the afternoon.

    High: 42 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 43.

    High: 43 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers. Mostly cloudy, with a high near 47.

    High: 47 °F

    Chance
    Showers

Detailed Forecast

Christmas Day
A 50 percent chance of showers. Mostly cloudy, with a high near 46. North wind 6 to 8 mph.
Tonight
A 50 percent chance of showers. Mostly cloudy, with a steady temperature around 44. South wind 6 to 8 mph.
Friday
A 50 percent chance of showers. Mostly cloudy, with a steady temperature around 43. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 36. South southwest wind 7 to 10 mph.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 42. South southeast wind around 5 mph becoming north northwest in the afternoon.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 35.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 43.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 36.
Monday
A chance of showers. Mostly cloudy, with a high near 47.
Monday Night
A chance of showers. Mostly cloudy, with a low around 38.
Tuesday
A chance of showers. Mostly cloudy, with a high near 47.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 40.
Wednesday
A chance of showers. Mostly cloudy, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.25°W (Elev. 105 ft)
Last Update:
1:25 am PST Dec 25, 2025
Forecast Valid:
6am PST Dec 25, 2025-6pm PST Dec 31, 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