Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Mostly Cloudy

46°F

8°C

Humidity 87%
Wind Speed NNW 4 MPH
Barometer 30.12 in (1019.98 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 20 Mar 11:00 PM PDT
Extended Forecast for

Mercer Island WA

Flood Watch March 20, 11:24pm until March 21, 05:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch March 20, 11:24pm until March 21, 05:00pm

    NOW until 5:00pm Sat

    Flood Watch

  • Tonight

    Low: 41 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 11am.  Cloudy, then gradually becoming mostly sunny, with a high near 50. Light north wind.

    High: 50 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain before 11pm, then a slight chance of rain and snow.  Partly cloudy, with a low around 38. Light and variable wind becoming south around 6 mph after midnight.  Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of rain and snow before 11am, then a slight chance of rain.  Partly sunny, with a high near 53. South wind around 6 mph becoming light and variable  in the morning.  Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 53 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 38. Northwest wind around 5 mph becoming calm  in the evening.

    Low: 38 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of rain after 11pm.  Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain.  Cloudy, with a high near 54.

    High: 54 °F

    Rain

Detailed Forecast

Tonight
A 20 percent chance of rain before 3am. Mostly cloudy, with a low around 41. North northeast wind 3 to 6 mph.
Saturday
A 20 percent chance of rain before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 50. Light north wind.
Saturday Night
A slight chance of rain before 11pm, then a slight chance of rain and snow. Partly cloudy, with a low around 38. Light and variable wind becoming south around 6 mph after midnight. Chance of precipitation is 20%.
Sunday
A chance of rain and snow before 11am, then a slight chance of rain. Partly sunny, with a high near 53. South wind around 6 mph becoming light and variable in the morning. Chance of precipitation is 30%. Little or no snow accumulation expected.
Sunday Night
Mostly cloudy, with a low around 38. Northwest wind around 5 mph becoming calm in the evening.
Monday
Mostly cloudy, with a high near 54.
Monday Night
A 30 percent chance of rain after 11pm. Mostly cloudy, with a low around 42.
Tuesday
Rain. Cloudy, with a high near 54.
Tuesday Night
Rain. Mostly cloudy, with a low around 42.
Wednesday
Rain. Mostly cloudy, with a high near 51.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 36.
Thursday
A slight chance of rain. Mostly sunny, with a high near 53.
Thursday Night
Partly cloudy, with a low around 36.
Friday
Partly sunny, with a high near 57.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.21°W (Elev. 121 ft)
11:27 am PDT Mar 20, 2026
11pm PDT Mar 20, 2026-6pm PDT Mar 27, 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