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.

Mostly Cloudy

64°F

18°C

Humidity 59%
Wind Speed N 4 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 03 Oct 04:35 PM PDT
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Rain likely before 4am, then a chance of rain after 5am. Mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Rain Likely

  • Saturday

    Saturday: A 50 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 64 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain before 11pm. Partly cloudy, with a low around 50. Calm wind becoming north around 5 mph after midnight.

    Low: 50 °F

    Chance Rain
    then Partly
    Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 66. North northeast wind 5 to 7 mph.

    High: 66 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47. Northeast wind 3 to 7 mph.

    Low: 47 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 49.

    Low: 49 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Tonight
Rain likely before 4am, then a chance of rain after 5am. Mostly cloudy, with a low around 54. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 50 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 64. Calm wind becoming north northwest around 5 mph in the afternoon.
Saturday Night
A 30 percent chance of rain before 11pm. Partly cloudy, with a low around 50. Calm wind becoming north around 5 mph after midnight.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 66. North northeast wind 5 to 7 mph.
Sunday Night
Mostly clear, with a low around 47. Northeast wind 3 to 7 mph.
Monday
Sunny, with a high near 71.
Monday Night
Clear, with a low around 49.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
A chance of rain, mainly after 11am. Mostly sunny, with a high near 68.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 51.
Thursday
A chance of rain. Partly sunny, with a high near 67.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 51.
Friday
A chance of rain. Partly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.18°W (Elev. 207 ft)
Last Update:
2:25 pm PDT Oct 3, 2025
Forecast Valid:
4pm PDT Oct 3, 2025-6pm PDT Oct 10, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation