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

53°F

12°C

Humidity 89%
Wind Speed N 0 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 09 Oct 05:53 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: Rain, mainly before 11am. High near 60. Light and variable wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Rain then
    Partly Sunny

  • Tonight

    Tonight: A 50 percent chance of rain, mainly after 2am. Mostly cloudy, with a low around 53. Light and variable wind becoming north around 5 mph in the evening.

    Low: 53 °F

    Slight Chance
    Rain then
    Chance Rain

  • Friday

    Friday: Rain. High near 59. South wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 59 °F

    Rain

  • Friday Night

    Friday Night: Rain likely. Mostly cloudy, with a low around 51. South wind 5 to 7 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 57. South southwest wind around 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 57 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 49. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Rain

  • Sunday

    Sunday: Rain. High near 55. Chance of precipitation is 80%.

    High: 55 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Rain

  • Columbus Day

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

    High: 55 °F

    Chance Rain

Detailed Forecast

Today
Rain, mainly before 11am. High near 60. Light and variable wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A 50 percent chance of rain, mainly after 2am. Mostly cloudy, with a low around 53. Light and variable wind becoming north around 5 mph in the evening.
Friday
Rain. High near 59. South wind around 6 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain likely. Mostly cloudy, with a low around 51. South wind 5 to 7 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 57. South southwest wind around 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Rain. Low around 49. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Rain. High near 55. Chance of precipitation is 80%.
Sunday Night
Rain. Mostly cloudy, with a low around 46.
Columbus Day
A chance of rain. Partly sunny, with a high near 55.
Monday Night
A slight chance of rain. Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 58.
Tuesday Night
A slight chance of rain. Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.25°W (Elev. 105 ft)
Last Update:
2:25 am PDT Oct 9, 2025
Forecast Valid:
6am PDT Oct 9, 2025-6pm PDT Oct 15, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation