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

Showers and Thunderstorms for the Eastern Third of the Country; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

Showers and thunderstorms will continue along and ahead of a cold front for the eastern third of the country. The rainfall for the Great Lakes region could prolong the ongoing flooding. Much cooler weather will filter in behind this cold front along and east of the Rockies. Where the rain is needed, the Southern High Plains, critical fire weather concerns through this weekend. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Clear

69°F

21°C

Humidity 23%
Wind Speed N 0 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 18 Apr 03:53 PM PDT
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Partly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. Calm wind becoming north 5 to 7 mph in the afternoon.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 51. North northwest wind around 6 mph becoming calm in the evening.

    Low: 51 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 73. Light north northeast wind.

    High: 73 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 52. Northwest wind around 5 mph becoming light and variable after midnight.

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain. Mostly cloudy, with a high near 66.

    High: 66 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain. Cloudy, with a high near 57.

    High: 57 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 48. Calm wind.
Sunday
Partly sunny, with a high near 73. Calm wind becoming north 5 to 7 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 51. North northwest wind around 6 mph becoming calm in the evening.
Monday
Partly sunny, with a high near 73. Light north northeast wind.
Monday Night
Mostly cloudy, with a low around 52. Northwest wind around 5 mph becoming light and variable after midnight.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 66.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 51.
Wednesday
A chance of rain. Cloudy, with a high near 57.
Wednesday Night
A chance of rain before 11pm. Mostly cloudy, with a low around 48.
Thursday
Partly sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 46.
Friday
Mostly sunny, with a high near 68.
Friday Night
Mostly clear, with a low around 47.
Saturday
Mostly sunny, with a high near 68.
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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:
11:26 am PDT Apr 18, 2026
Forecast Valid:
4pm PDT Apr 18, 2026-6pm PDT Apr 25, 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