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.

Clear

63°F

17°C

Humidity 72%
Wind Speed WNW 4 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 08 Oct 02:00 PM PDT
Extended Forecast for

Mercer Island WA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 68. Calm wind.

    High: 68 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 56. Light and variable wind becoming south 5 to 10 mph after midnight.

    Low: 56 °F

    Increasing
    Clouds

  • Friday

    Friday: Rain, mainly before 10am. Steady temperature around 59. South southwest wind 5 to 15 mph becoming north northeast in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 59 °F

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: A chance of rain before 1am, then a slight chance of rain after 4am. Mostly cloudy, with a low around 51. Light and variable wind becoming south southeast 5 to 7 mph in the evening. Chance of precipitation is 50%.

    Low: 51 °F

    Chance Rain
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 11am. Partly sunny, with a high near 59. South wind around 6 mph becoming calm.

    High: 59 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44.

    Low: 44 °F

    Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 63.

    High: 63 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 68. Calm wind.
Tonight
Increasing clouds, with a low around 56. Light and variable wind becoming south 5 to 10 mph after midnight.
Friday
Rain, mainly before 10am. Steady temperature around 59. South southwest wind 5 to 15 mph becoming north northeast in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain before 1am, then a slight chance of rain after 4am. Mostly cloudy, with a low around 51. Light and variable wind becoming south southeast 5 to 7 mph in the evening. Chance of precipitation is 50%.
Saturday
A 20 percent chance of rain before 11am. Partly sunny, with a high near 59. South wind around 6 mph becoming calm.
Saturday Night
Mostly clear, with a low around 48.
Sunday
Sunny, with a high near 61.
Sunday Night
Clear, with a low around 44.
Columbus Day
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
A slight chance of rain. Partly sunny, with a high near 62.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 50.
Wednesday
A slight chance of rain. Partly sunny, with a high near 62.
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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:
12:25 pm PDT Oct 8, 2026
Forecast Valid:
2pm PDT Oct 8, 2026-6pm PDT Oct 14, 2026
 
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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