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

50°F

10°C

Humidity 81%
Wind Speed ENE 3 MPH
Barometer 29.83 in (1010.16 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 10 Oct 07:35 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: A 30 percent chance of showers before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 58 °F

    Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 44. North wind around 5 mph becoming calm in the evening.

    Low: 44 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, sunny, with a high near 61. Northeast wind 3 to 8 mph.

    High: 61 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 42. North wind 5 to 7 mph becoming calm in the evening.

    Low: 42 °F

    Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 64. Calm wind.

    High: 64 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of rain after 11pm. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain before 11am. Mostly cloudy, with a high near 64.

    High: 64 °F

    Chance Rain
    then Partly
    Sunny

Detailed Forecast

Today
A 30 percent chance of showers before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 58. Calm wind becoming north northwest around 6 mph in the afternoon.
Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 44. North wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 9am. Otherwise, sunny, with a high near 61. Northeast wind 3 to 8 mph.
Sunday Night
Clear, with a low around 42. North wind 5 to 7 mph becoming calm in the evening.
Columbus Day
Sunny, with a high near 64. Calm wind.
Monday Night
Mostly clear, with a low around 44.
Tuesday
Partly sunny, with a high near 63.
Tuesday Night
A chance of rain after 11pm. Mostly cloudy, with a low around 51.
Wednesday
A chance of rain before 11am. Mostly cloudy, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 69.
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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:
2:45 am PDT Oct 10, 2026
Forecast Valid:
7am PDT Oct 10, 2026-6pm PDT Oct 16, 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