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

45°F

7°C

Humidity 93%
Wind Speed SSE 4 MPH
Barometer 29.59 in (1002.03 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 04 Jan 06:55 PM PST
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Rain, mainly before 4am. Low around 41. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain

  • Monday

    Monday: A 30 percent chance of rain, mainly before 7am. Partly sunny, with a high near 45. Light south wind.

    High: 45 °F

    Chance Rain
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Rain, mainly after 4am. Low around 39. South wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Chance Rain
    then Rain

  • Tuesday

    Tuesday: Rain. High near 45. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 45 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 10pm. Low around 39. South southwest wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Rain

  • Wednesday

    Wednesday: Rain. High near 45. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 45 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain. Low around 38. Chance of precipitation is 90%.

    Low: 38 °F

    Rain

  • Thursday

    Thursday: Rain. Mostly cloudy, with a high near 46.

    High: 46 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely before 4am, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Rain Likely
    then
    Rain/Snow
    Likely

Detailed Forecast

Tonight
Rain, mainly before 4am. Low around 41. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A 30 percent chance of rain, mainly before 7am. Partly sunny, with a high near 45. Light south wind.
Monday Night
Rain, mainly after 4am. Low around 39. South wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Rain. High near 45. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Rain, mainly before 10pm. Low around 39. South southwest wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Rain. High near 45. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain. Low around 38. Chance of precipitation is 90%.
Thursday
Rain. Mostly cloudy, with a high near 46.
Thursday Night
Rain likely before 4am, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 41.
Friday
A chance of rain and snow before 10am, then a chance of rain. Mostly cloudy, with a high near 50.
Friday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 41.
Saturday
A slight chance of rain. Mostly cloudy, with a high near 52.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 42.
Sunday
A slight chance of rain. Mostly cloudy, with a high near 52.
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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:
7:01 pm PST Jan 4, 2026
Forecast Valid:
7pm PST Jan 4, 2026-6pm PST Jan 11, 2026
 
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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