Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Clear

70°F

21°C

Humidity 60%
Wind Speed WNW 5 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 19 Aug 12:30 PM PDT
Extended Forecast for

Mercer Island WA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 76. Light northwest wind.

    High: 76 °F

    Mostly Sunny

  • Tonight

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

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm  in the evening.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 78. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 78 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 11pm.  Mostly cloudy, with a low around 60.

    Low: 60 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms.  Mostly cloudy, with a high near 71. Chance of precipitation is 40%.

    High: 71 °F

    Chance
    Showers

  • Saturday Night

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

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 74.

    High: 74 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 76. Light northwest wind.
Tonight
Mostly clear, with a low around 59. Light north northeast wind.
Thursday
Sunny, with a high near 78. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 78. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 60.
Saturday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 71. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
Mostly cloudy, with a high near 74.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Partly sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.25°W (Elev. 105 ft)
11:26 am PDT Aug 19, 2026
12pm PDT Aug 19, 2026-6pm PDT Aug 25, 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