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

37°F

3°C

Humidity 93%
Wind Speed SSE 5 MPH
Barometer 30.11 in (1019.64 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 16 Apr 02:35 AM PDT
Extended Forecast for

Mercer Island WA

  • Overnight

    Overnight: A slight chance of rain between 3am and 4am. Patchy frost after 5am. Otherwise, mostly cloudy, with a low around 36. Calm wind. Chance of precipitation is 20%.

    Low: 36 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 57. South southwest wind 3 to 5 mph.

    High: 57 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 40. South southwest wind around 5 mph becoming calm after midnight.

    Low: 40 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 58. Calm wind.

    High: 58 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain. Mostly cloudy, with a high near 67.

    High: 67 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A slight chance of rain before 11pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of rain between 3am and 4am. Patchy frost after 5am. Otherwise, mostly cloudy, with a low around 36. Calm wind. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 57. South southwest wind 3 to 5 mph.
Thursday Night
Mostly cloudy, with a low around 40. South southwest wind around 5 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 58. Calm wind.
Friday Night
Mostly cloudy, with a low around 42. Light and variable wind.
Saturday
Mostly cloudy, with a high near 66.
Saturday Night
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 49.
Sunday
A chance of rain. Mostly cloudy, with a high near 67.
Sunday Night
A slight chance of rain before 11pm. Mostly cloudy, with a low around 49.
Monday
A slight chance of rain. Partly sunny, with a high near 68.
Monday Night
A slight chance of rain. Mostly cloudy, with a low around 50.
Tuesday
A chance of rain. Partly sunny, with a high near 62.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 49.
Wednesday
A chance of rain. Mostly cloudy, with a high near 57.
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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:
1:20 am PDT Apr 16, 2026
Forecast Valid:
2am PDT Apr 16, 2026-6pm PDT Apr 22, 2026
 
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