National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Boeing Field - King County International Airport (KBFI)

Lat: 47.54548°NLon: 122.3147°WElev: 20.0ft.

Mostly Cloudy

49°F

9°C

Humidity 86%
Wind Speed S 8 MPH
Barometer 30.12 in (1019.98 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 09 Dec 06:53 AM PST
Extended Forecast for

Mercer Island WA

Flood Watch December 9, 07:08am until December 12, 04:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch December 9, 07:08am until December 12, 04:00pm

    NOW until 4:00pm Fri

    Flood Watch

  • Today

    High: 53 °F

    Chance Rain
    then Rain
    Likely

  • Tonight

    Tonight: Rain. Patchy fog before midnight. Temperature rising to around 57 by 3am. South southwest wind 11 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 49 °F⇑

    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: Rain. High near 58. Breezy, with a south southwest wind 17 to 22 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    High: 58 °F

    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain. Low around 51. South southwest wind 7 to 9 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Rain

  • Thursday

    Thursday: Rain. High near 54. South wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 54 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Rain Likely

  • Friday

    Friday: A 40 percent chance of rain. Cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Friday Night

    Friday Night: A chance of rain, mainly before 10pm. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain

Detailed Forecast

Today
Rain likely, mainly after 1pm. Cloudy, with a high near 53. South wind 3 to 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain. Patchy fog before midnight. Temperature rising to around 57 by 3am. South southwest wind 11 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Rain. High near 58. Breezy, with a south southwest wind 17 to 22 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Wednesday Night
Rain. Low around 51. South southwest wind 7 to 9 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Thursday
Rain. High near 54. South wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 40 percent chance of rain. Cloudy, with a high near 55.
Friday Night
A chance of rain, mainly before 10pm. Mostly cloudy, with a low around 48.
Saturday
A chance of rain, mainly after 10am. Mostly cloudy, with a high near 55.
Saturday Night
Rain likely. Mostly cloudy, with a low around 49.
Sunday
Rain likely. Mostly cloudy, with a high near 54.
Sunday Night
Rain. Mostly cloudy, with a low around 48.
Monday
Rain. Cloudy, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.6°N 122.22°W (Elev. 3 ft)
Last Update:
7:00 am PST Dec 9, 2025
Forecast Valid:
7am PST Dec 9, 2025-6pm PST Dec 15, 2025
 
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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