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

45°F

7°C

Humidity 87%
Wind Speed NE 3 MPH
Barometer 30.33 in (1027.09 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 02 Dec 07:35 PM PST
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Patchy fog between 1am and 2am. Otherwise, mostly cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: A slight chance of rain between 9am and 10am. Patchy fog between 9am and 10am. Otherwise, mostly cloudy, with a high near 47. Calm wind. Chance of precipitation is 20%.

    High: 47 °F

    Slight Chance
    Rain and
    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 10pm. Mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Chance Rain

  • Thursday

    Thursday: Rain. High near 48. South southeast wind 3 to 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 46. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F

    Rain

  • Friday

    Friday: Rain. High near 55. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 49. Chance of precipitation is 80%.

    Low: 49 °F

    Rain

  • Saturday

    Saturday: Rain. Mostly cloudy, with a high near 53.

    High: 53 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy fog between 1am and 2am. Otherwise, mostly cloudy, with a low around 38. Calm wind.
Wednesday
A slight chance of rain between 9am and 10am. Patchy fog between 9am and 10am. Otherwise, mostly cloudy, with a high near 47. Calm wind. Chance of precipitation is 20%.
Wednesday Night
A 30 percent chance of rain after 10pm. Mostly cloudy, with a low around 41. Calm wind.
Thursday
Rain. High near 48. South southeast wind 3 to 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain. Low around 46. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 55. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain. Low around 49. Chance of precipitation is 80%.
Saturday
Rain. Mostly cloudy, with a high near 53.
Saturday Night
Rain likely. Mostly cloudy, with a low around 47.
Sunday
Rain. Cloudy, with a high near 54.
Sunday Night
Rain likely. Mostly cloudy, with a low around 47.
Monday
Rain likely. Cloudy, with a high near 55.
Monday Night
Rain. Cloudy, with a low around 49.
Tuesday
Rain. Cloudy, with a high near 54.
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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 Dec 2, 2025
Forecast Valid:
7pm PST Dec 2, 2025-6pm PST Dec 9, 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