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

Significant Coastal Impacts to the Eastern Seaboard; Hurricane Nolo to Impact Hawaii

A Nor'easter will bring significant coastal impacts to the Mid-Atlantic and New England into Monday. Moderate to major coastal flooding, heavy rain, strong winds and high surf expected. Hurricane Nolo is expected to remain south of the Big Island of Hawaii. However, strong winds, damaging waves, and heavy rainfall may bring significant, life-threatening flooding and mudslides through the weekend. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Clear

50°F

10°C

Humidity 87%
Wind Speed N 0 MPH
Barometer 30.21 in (1023.03 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 26 Sep 08:35 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: Mostly sunny, with a high near 65. Calm wind becoming north around 6 mph in the afternoon.

    High: 65 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 49. Northeast wind around 6 mph.

    Low: 49 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 65. Northeast wind 5 to 8 mph becoming north northwest in the afternoon.

    High: 65 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 48. North northwest wind around 5 mph becoming calm after midnight.

    Low: 48 °F

    Increasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 67. Light and variable wind.

    High: 67 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after 11pm. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain likely. Cloudy, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 11pm. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Rain Likely

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 65. Calm wind becoming north around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 49. Northeast wind around 6 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 65. Northeast wind 5 to 8 mph becoming north northwest in the afternoon.
Sunday Night
Increasing clouds, with a low around 48. North northwest wind around 5 mph becoming calm after midnight.
Monday
Partly sunny, with a high near 67. Light and variable wind.
Monday Night
A 30 percent chance of rain after 11pm. Mostly cloudy, with a low around 55.
Tuesday
Rain likely. Cloudy, with a high near 64. Chance of precipitation is 60%.
Tuesday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
A slight chance of rain. Mostly cloudy, with a low around 52.
Thursday
A slight chance of rain. Mostly cloudy, with a high near 64.
Thursday Night
A slight chance of rain. Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 63.
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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 pm PDT Sep 25, 2026
Forecast Valid:
8am PDT Sep 26, 2026-6pm PDT Oct 2, 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