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

54°F

12°C

Humidity 93%
Wind Speed SSE 6 MPH
Barometer 29.55 in (1000.68 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 16 Nov 07:00 PM PST
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Rain, mainly after 1am. Low around 49. Light southeast wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Slight Chance
    Rain then
    Rain

  • Monday

    Monday: Rain. High near 53. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 53 °F

    Rain

  • Monday Night

    Monday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44. Light south wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Rain Likely

  • Tuesday

    Tuesday: A 50 percent chance of rain, mainly before 4pm. Mostly cloudy, with a high near 52. South southwest wind 3 to 5 mph.

    High: 52 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before 10pm. Mostly cloudy, with a low around 41. Calm wind.

    Low: 41 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Thursday

    Thursday: A chance of rain. Partly sunny, with a high near 55.

    High: 55 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

Detailed Forecast

Tonight
Rain, mainly after 1am. Low around 49. Light southeast wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain. High near 53. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44. Light south wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
A 50 percent chance of rain, mainly before 4pm. Mostly cloudy, with a high near 52. South southwest wind 3 to 5 mph.
Tuesday Night
A 20 percent chance of rain before 10pm. Mostly cloudy, with a low around 41. Calm wind.
Wednesday
Partly sunny, with a high near 54.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 45.
Thursday
A chance of rain. Partly sunny, with a high near 55.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 45.
Friday
Rain, mainly after 10am. Mostly cloudy, with a high near 54.
Friday Night
Rain. Mostly cloudy, with a low around 47.
Saturday
Rain. Mostly cloudy, with a high near 53.
Saturday Night
Rain likely. Mostly cloudy, with a low around 44.
Sunday
Rain likely. Mostly cloudy, with a high near 51.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.6°N 122.22°W (Elev. 3 ft)
Last Update:
7:00 pm PST Nov 16, 2025
Forecast Valid:
7pm PST Nov 16, 2025-6pm PST Nov 23, 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