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

68°F

20°C

Humidity 50%
Wind Speed S 11 MPH
Barometer 29.83 in (1010.16 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 01 Oct 04:53 PM PDT
Extended Forecast for

Mercer Island WA

  • This Afternoon

    This Afternoon: A 50 percent chance of showers. Partly sunny, with a steady temperature around 64. South wind around 8 mph.

    High: 64 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers likely before 10pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 53. South southeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers before 9am, then a chance of showers after 11am. Partly sunny, with a high near 68. South southwest wind around 7 mph. Chance of precipitation is 40%.

    High: 68 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 51. Light southeast wind.

    Low: 51 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 66. Calm wind becoming west around 5 mph in the afternoon.

    High: 66 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers, mainly after 11pm. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers. Partly sunny, with a high near 64.

    High: 64 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers. Partly sunny, with a steady temperature around 64. South wind around 8 mph.
Tonight
Showers likely before 10pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 53. South southeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A chance of showers before 9am, then a chance of showers after 11am. Partly sunny, with a high near 68. South southwest wind around 7 mph. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 51. Light southeast wind.
Friday
Partly sunny, with a high near 66. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
A 30 percent chance of showers, mainly after 11pm. Mostly cloudy, with a low around 52.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Clear, with a low around 47.
Monday
Sunny, with a high near 70.
Monday Night
Clear, with a low around 49.
Tuesday
Sunny, with a high near 71.
Tuesday Night
Mostly clear, with a low around 49.
Wednesday
Sunny, with a high near 68.
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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:
2:25 pm PDT Oct 1, 2025
Forecast Valid:
5pm PDT Oct 1, 2025-6pm PDT Oct 8, 2025
 
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Additional Resources

Radar & Satellite Image

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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