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.

Mostly Cloudy

48°F

9°C

Humidity 66%
Wind Speed N 0 MPH
Barometer 30.35 in (1027.77 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 03 Dec 01:35 PM PST
Extended Forecast for

Mercer Island WA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 46. Calm wind.

    High: 46 °F

    Mostly Cloudy

  • Tonight

    Tonight: Rain, mainly after 3am. Low around 41. Light south southeast wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Mostly Cloudy
    then Rain

  • Thursday

    Thursday: Rain, mainly before 2pm. High near 48. South wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 48 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 45. South wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Rain

  • Friday

    Friday: Rain. High near 54. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 47. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 47 °F

    Rain

  • Saturday

    Saturday: Rain. High near 52. Chance of precipitation is 90%.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Cloudy, with a low around 47.

    Low: 47 °F

    Rain

  • Sunday

    Sunday: Rain. Cloudy, with a high near 55.

    High: 55 °F

    Rain

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 46. Calm wind.
Tonight
Rain, mainly after 3am. Low around 41. Light south southeast wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Rain, mainly before 2pm. High near 48. South wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain. Low around 45. South wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 54. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain. Low around 47. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 52. Chance of precipitation is 90%.
Saturday Night
Rain. Cloudy, with a low around 47.
Sunday
Rain. Cloudy, with a high near 55.
Sunday Night
Rain, mainly before 10pm. Mostly cloudy, with a low around 48.
Monday
Rain. Cloudy, with a high near 55.
Monday Night
Rain. Cloudy, with a low around 49.
Tuesday
Rain. Cloudy, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.22°W (Elev. 118 ft)
Last Update:
1:25 pm PST Dec 3, 2025
Forecast Valid:
1pm PST Dec 3, 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