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

Heavy Rainfall on the Western Gulf Coast; Severe Thunderstorms in the Southern Plains Friday

A multi-day heavy rainfall event will continue over the western Gulf Coast through Monday. Slight Risks of excessive rainfall have been issued, and Flood Watches remain in effect through Monday evening. Scattered severe storms capable of producing large hail and damaging winds are possible across western portions of Texas and Oklahoma on Friday. Read More >

Current conditions at

Boeing Field - King County International Airport (KBFI)

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

Clear

64°F

18°C

Humidity 48%
Wind Speed N 3 MPH
Barometer 29.99 in (1015.58 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 21 May 11:35 PM PDT
Extended Forecast for

Mercer Island WA

  • Tonight

    Tonight: Mostly clear, with a low around 53. Light north northeast wind.

    Low: 53 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 73. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 73 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 55. North northwest wind around 6 mph becoming calm in the evening.

    Low: 55 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 71. Southwest wind 3 to 5 mph.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 53. West wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of rain after 11pm. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance Rain

  • Memorial Day

    Memorial Day: Rain. Cloudy, with a high near 60.

    High: 60 °F

    Rain

  • Monday Night

    Monday Night: Rain likely, mainly before 11pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 53. Light north northeast wind.
Friday
Sunny, with a high near 73. Calm wind becoming north northwest around 6 mph in the afternoon.
Friday Night
Increasing clouds, with a low around 55. North northwest wind around 6 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 71. Southwest wind 3 to 5 mph.
Saturday Night
Partly cloudy, with a low around 53. West wind around 5 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 69.
Sunday Night
A 30 percent chance of rain after 11pm. Mostly cloudy, with a low around 53.
Memorial Day
Rain. Cloudy, with a high near 60.
Monday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 49.
Tuesday
A chance of rain, mainly before 11am. Partly sunny, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
A slight chance of rain. Partly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.55°N 122.24°W (Elev. 3 ft)
Last Update:
11:26 pm PDT May 21, 2026
Forecast Valid:
11pm PDT May 21, 2026-6pm PDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation