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

Significant Coastal Impacts to the Mid-Atlantic and Northeast; Tropical Storm Nolo to Impact Hawaii

A strong coastal storm will bring moderate to major coastal flooding, strong winds, heavy rainfall and high surf to the Mid-Atlantic and New England. Tropical Storm Nolo is expected to strengthen into a hurricane today as it moves north toward the Big Island of Hawaii. Heavy rainfall may produce life-threatening, catastrophic flooding and mudslides. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Clear

55°F

13°C

Humidity 71%
Wind Speed N 4 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 24 Sep 09:20 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: A 10 percent chance of rain after 5pm. Mostly cloudy, with a high near 64. North northwest wind 3 to 5 mph.

    High: 64 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Tonight

    Tonight: Rain. Low around 54. Calm wind. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Rain

  • Friday

    Friday: Rain, mainly before 11am, then showers and possibly a thunderstorm after 11am. High near 63. South southwest wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 63 °F

    Showers

  • Friday Night

    Friday Night: Rain likely before 11pm. Mostly cloudy, with a low around 50. South wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Rain Likely
    then Partly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 65. South wind around 5 mph becoming calm in the morning.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

Detailed Forecast

Today
A 10 percent chance of rain after 5pm. Mostly cloudy, with a high near 64. North northwest wind 3 to 5 mph.
Tonight
Rain. Low around 54. Calm wind. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain, mainly before 11am, then showers and possibly a thunderstorm after 11am. High near 63. South southwest wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Rain likely before 11pm. Mostly cloudy, with a low around 50. South wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 65. South wind around 5 mph becoming calm in the morning.
Saturday Night
Mostly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 65.
Sunday Night
Partly cloudy, with a low around 49.
Monday
Partly sunny, with a high near 65.
Monday Night
A slight chance of rain after 11pm. Mostly cloudy, with a low around 52.
Tuesday
A chance of rain. Mostly cloudy, with a high near 65.
Tuesday Night
A chance of rain. Partly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 66.
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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:
11:26 pm PDT Sep 23, 2026
Forecast Valid:
9am PDT Sep 24, 2026-6pm PDT Sep 30, 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