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Heavy Rain in the Southern Appalachians; Fire Weather and Heat in the West; Monitoring Tropical Storm Erin

Heavy to excessive rainfall over the southern Appalachians may bring areas of flooding today. Gusty winds and low relative humidity will bring critical fire weather conditions to parts of the Great Basin and northern Rockies today and Thursday. Hot to extremely hot temperatures are in place through today across parts of the western U.S. 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 72%
Wind Speed W 4 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 13 Aug 07:05 AM PDT
Extended Forecast for

Mercer Island WA

  • Today

    Today: A 10 percent chance of showers after 5pm. Mostly sunny, with a high near 78. South wind 6 to 8 mph.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 10pm. Mostly cloudy, with a low around 61. Northeast wind around 6 mph becoming south after midnight.

    Low: 61 °F

    Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 73. South wind 6 to 8 mph.

    High: 73 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely, mainly after 11pm. Mostly cloudy, with a low around 61. Southwest wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 61 °F

    Rain Likely

  • Friday

    Friday: Rain. High near 68. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 68 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 63. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Rain

  • Saturday

    Saturday: Rain. High near 74. Chance of precipitation is 90%.

    High: 74 °F

    Rain

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 11pm. Mostly cloudy, with a low around 59.

    Low: 59 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers. Partly sunny, with a high near 75.

    High: 75 °F

    Slight Chance
    Showers

Detailed Forecast

Today
A 10 percent chance of showers after 5pm. Mostly sunny, with a high near 78. South wind 6 to 8 mph.
Tonight
A 30 percent chance of showers, mainly before 10pm. Mostly cloudy, with a low around 61. Northeast wind around 6 mph becoming south after midnight.
Thursday
Mostly cloudy, with a high near 73. South wind 6 to 8 mph.
Thursday Night
Rain likely, mainly after 11pm. Mostly cloudy, with a low around 61. Southwest wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 68. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
Rain. Low around 63. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain. High near 74. Chance of precipitation is 90%.
Saturday Night
A chance of showers, mainly before 11pm. Mostly cloudy, with a low around 59.
Sunday
A slight chance of showers. Partly sunny, with a high near 75.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Partly sunny, with a high near 76.
Monday Night
Mostly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.58°N 122.22°W (Elev. 118 ft)
Last Update:
2:25 am PDT Aug 13, 2025
Forecast Valid:
7am PDT Aug 13, 2025-6pm PDT Aug 19, 2025
 
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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