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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Clear

70°F

21°C

Humidity 68%
Wind Speed NW 8 MPH
Barometer 29.95 in (1014.22 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 20 Aug 12:20 AM PDT
Extended Forecast for

Mercer Island WA

  • Overnight

    Overnight: Mostly clear, with a low around 59. Light northeast wind.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. Light and variable wind.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Increasing clouds, with a high near 83. Light and variable wind.

    High: 83 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 62. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 62 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A 50 percent chance of rain. Mostly cloudy, with a high near 73.

    High: 73 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 73.

    High: 73 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 59. Light northeast wind.
Thursday
Sunny, with a high near 83. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 61. Light and variable wind.
Friday
Increasing clouds, with a high near 83. Light and variable wind.
Friday Night
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 62. Calm wind becoming south southwest around 6 mph after midnight.
Saturday
A 50 percent chance of rain. Mostly cloudy, with a high near 73.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
Mostly cloudy, with a high near 73.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A slight chance of rain. Partly cloudy, with a low around 58.
Wednesday
Partly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.18°W (Elev. 207 ft)
Last Update:
11:26 pm PDT Aug 19, 2026
Forecast Valid:
12am PDT Aug 20, 2026-6pm PDT Aug 26, 2026
 
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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