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

41°F

5°C

Humidity 93%
Wind Speed SE 4 MPH
Barometer 29.65 in (1004.06 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 25 Dec 11:55 PM PST
Extended Forecast for

Mercer Island WA

  • Overnight

    Overnight: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 41. Southeast wind around 8 mph.

    Low: 41 °F

    Slight Chance
    Rain

  • Friday

    Friday: Rain before 4pm, then rain and snow likely. High near 45. Southwest wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 45 °F

    Rain then
    Rain/Snow

  • Friday Night

    Friday Night: Rain and snow likely before 7pm, then rain likely between 7pm and 1am, then a chance of rain and snow after 1am. Mostly cloudy, with a low around 36. Southwest wind 5 to 8 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 36 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Saturday

    Saturday: Mostly sunny, with a high near 41. Calm wind.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 41. Southeast wind around 8 mph.
Friday
Rain before 4pm, then rain and snow likely. High near 45. Southwest wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Friday Night
Rain and snow likely before 7pm, then rain likely between 7pm and 1am, then a chance of rain and snow after 1am. Mostly cloudy, with a low around 36. Southwest wind 5 to 8 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Saturday
Mostly sunny, with a high near 41. Calm wind.
Saturday Night
Mostly cloudy, with a low around 34. Calm wind.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Mostly cloudy, with a low around 37.
Monday
Mostly cloudy, with a high near 45.
Monday Night
Mostly cloudy, with a low around 38.
Tuesday
Mostly cloudy, with a high near 47.
Tuesday Night
A slight chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A chance of rain. Cloudy, with a high near 48.
Wednesday Night
A chance of rain. Cloudy, with a low around 43.
New Year's Day
Rain likely. Mostly cloudy, with a high near 48.
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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:
7:01 pm PST Dec 25, 2025
Forecast Valid:
12am PST Dec 26, 2025-6pm PST Jan 1, 2026
 
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