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 N 0 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 41°F (5°C)
Visibility 7.00 mi
Last update 02 Dec 06:20 AM PST
Extended Forecast for

Mercer Island WA

  • Today

    Today: A 30 percent chance of rain before 7am. Cloudy, with a high near 48. Calm wind.

    High: 48 °F

    Chance Rain
    then Cloudy

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Cloudy then
    Patchy Fog

  • Wednesday

    Wednesday: Cloudy, with a high near 46. Light and variable wind.

    High: 46 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after 10pm. Mostly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Rain. High near 48. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 46. 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 54. Chance of precipitation is 90%.

    High: 54 °F

    Rain

  • Friday Night

    Friday Night: Rain. Cloudy, with a low around 48.

    Low: 48 °F

    Rain

  • Saturday

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

    High: 53 °F

    Rain

Detailed Forecast

Today
A 30 percent chance of rain before 7am. Cloudy, with a high near 48. Calm wind.
Tonight
Patchy fog after 5am. Otherwise, cloudy, with a low around 38. Calm wind.
Wednesday
Cloudy, with a high near 46. Light and variable wind.
Wednesday Night
A 20 percent chance of rain after 10pm. Mostly cloudy, with a low around 40. Calm wind.
Thursday
Rain. High near 48. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain. Low around 46. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 54. Chance of precipitation is 90%.
Friday Night
Rain. Cloudy, with a low around 48.
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 53.
Sunday Night
Rain likely. Mostly cloudy, with a low around 46.
Monday
Rain. Cloudy, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.22°W (Elev. 118 ft)
Last Update:
1:25 am PST Dec 2, 2025
Forecast Valid:
6am PST Dec 2, 2025-6pm PST Dec 8, 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