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

Renton Municipal Airport (KRNT)

Lat: 47.49509°NLon: 122.21437°WElev: 23.0ft.

Partly Cloudy

52°F

11°C

Humidity 71%
Wind Speed S 4 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 20 Nov 10:53 AM PST
Extended Forecast for

Mercer Island WA

  • Today

    Today: Sunny, with a high near 54. South wind 3 to 5 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 42. South southeast wind 3 to 5 mph.

    Low: 42 °F

    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of rain. Partly sunny, with a high near 54. South wind around 6 mph.

    High: 54 °F

    Slight Chance
    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 49. South wind around 7 mph.

    Low: 49 °F

    Chance Rain

  • Saturday

    Saturday: A 50 percent chance of rain. Mostly cloudy, with a high near 56. South wind around 6 mph.

    High: 56 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly after 10pm. Mostly cloudy, with a low around 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Rain Likely

  • Sunday

    Sunday: Rain. High near 54. Chance of precipitation is 80%.

    High: 54 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Cloudy, with a low around 42.

    Low: 42 °F

    Rain

  • Monday

    Monday: Rain likely, mainly before 10am. Partly sunny, with a high near 50.

    High: 50 °F

    Rain Likely

Detailed Forecast

Today
Sunny, with a high near 54. South wind 3 to 5 mph.
Tonight
Partly cloudy, with a low around 42. South southeast wind 3 to 5 mph.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 54. South wind around 6 mph.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 49. South wind around 7 mph.
Saturday
A 50 percent chance of rain. Mostly cloudy, with a high near 56. South wind around 6 mph.
Saturday Night
Rain likely, mainly after 10pm. Mostly cloudy, with a low around 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Rain. High near 54. Chance of precipitation is 80%.
Sunday Night
Rain. Cloudy, with a low around 42.
Monday
Rain likely, mainly before 10am. Partly sunny, with a high near 50.
Monday Night
A slight chance of rain before 10pm. Mostly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 48.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 39.
Wednesday
A chance of rain and snow. Mostly cloudy, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.21°W (Elev. 121 ft)
Last Update:
7:00 am PST Nov 20, 2025
Forecast Valid:
11am PST Nov 20, 2025-6pm PST Nov 26, 2025
 
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