Severe Thunderstorm and Heavy Rainfall Threat Tonight; Heat Continues on Tuesday Across the Eastern U.S.
Severe weather and flash flooding threats continue across the Central Plains and Midwest into tonight. Very large hail, strong tornadoes and damaging winds are expected. An early season heat wave will continue to challenge temperature records across the eastern U.S. through Wednesday. Read More >
Current conditions at
Boeing Field - King County International Airport (KBFI)
Lat: 47.54548°NLon: 122.3147°WElev: 20.0ft.
Overcast
64°F
18°C
| Humidity | 48% |
| Wind Speed | N 3 MPH |
| Barometer | 30.2 in (1022.69 mb) |
| Dewpoint | 44°F (7°C) |
| Visibility | 10.00 mi |
| Last update | 18 May 08:00 PM PDT |
Extended Forecast for
Mercer Island WA
Tonight
Low: 50 °F
Mostly Cloudy
Tuesday
High: 66 °F
Mostly Cloudy
Tuesday Night
Low: 51 °F
Mostly Cloudy
Wednesday
High: 69 °F
Mostly Sunny
Wednesday Night
Low: 51 °F
Partly Cloudy
Thursday
High: 75 °F
Mostly Sunny
Thursday Night
Low: 53 °F
Partly Cloudy
Friday
High: 75 °F
Mostly Sunny
Friday Night
Low: 54 °F
Partly Cloudy
Detailed Forecast
Tonight
Mostly cloudy, with a low around 50. North northeast wind around 6 mph becoming calm after midnight.
Tuesday
Mostly cloudy, with a high near 66. Light and variable wind.
Tuesday Night
Mostly cloudy, with a low around 51. Light northeast wind.
Wednesday
Mostly sunny, with a high near 69. Calm wind becoming north northwest around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 51. North northwest wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Partly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Partly sunny, with a high near 67.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 50.
Memorial Day
A chance of rain. Partly sunny, with a high near 64.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Mercer Island WA
47.58°N 122.22°W (Elev. 118 ft)
47.58°N 122.22°W (Elev. 118 ft)
11:27 am PDT May 18, 2026
8pm PDT May 18, 2026-6pm PDT May 25, 2026
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