Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Overcast

57°F

14°C

Humidity 76%
Wind Speed SE 6 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 05 Sep 08:20 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: A 30 percent chance of rain after 5pm.  Partly sunny, with a high near 70. Light and variable wind.

    High: 70 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tonight

    Tonight: A 30 percent chance of rain, mainly before 7pm.  Partly cloudy, with a low around 54. Light north northeast wind.

    Low: 54 °F

    Chance Rain
    then Partly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 71. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 71 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. Northwest wind around 5 mph becoming calm  in the evening.

    Low: 56 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Partly sunny, with a high near 70. South southwest wind 5 to 7 mph.

    High: 70 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

Today
A 30 percent chance of rain after 5pm. Partly sunny, with a high near 70. Light and variable wind.
Tonight
A 30 percent chance of rain, mainly before 7pm. Partly cloudy, with a low around 54. Light north northeast wind.
Sunday
Mostly sunny, with a high near 71. Calm wind becoming northwest around 6 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 56. Northwest wind around 5 mph becoming calm in the evening.
Labor Day
Partly sunny, with a high near 70. South southwest wind 5 to 7 mph.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A slight chance of rain. Mostly sunny, with a high near 76.
Thursday Night
Partly cloudy, with a low around 57.
Friday
A chance of rain. Mostly cloudy, with a high near 71.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.22°W (Elev. 118 ft)
11:26 pm PDT Sep 4, 2026
8am PDT Sep 5, 2026-6pm PDT Sep 11, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database