Tracking a Winter Storm; Unusual Early-Season Heat Wave in the Southwest

A major winter storm will organize across the Northern Plains today and then rapidly strengthen as it moves into the Great Lakes on Sunday. Heavy snow and blowing snow are likely to persist over the Great Lakes into Monday night. Dry and gusty winds will produce a critical fire risk across the central/southern Plains. An early heatwave will begin to intensify over the western U.S. into next week. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Clear

35°F

2°C

Humidity 88%
Wind Speed N 0 MPH
Barometer 30.47 in (1031.83 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 15 Mar 02:53 AM PDT
Extended Forecast for

Mercer Island WA

  • Overnight

    Overnight: Mostly cloudy, with a low around 32. Calm wind.

    Low: 32 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly after 5pm.  High near 48. Calm wind.  Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Mostly Cloudy
    then Rain

  • Sunday Night

    Sunday Night: Rain, mainly before 9pm.  Low around 42. Calm wind becoming south around 5 mph after midnight.  Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Rain

  • Monday

    Monday: Rain.  High near 56. South wind 6 to 8 mph.  Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 11pm.  Cloudy, with a low around 49. South wind around 8 mph.  Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 49 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain.  High near 55. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain.  Low around 51. Chance of precipitation is 100%.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain.  Cloudy, with a high near 57.

    High: 57 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain.  Cloudy, with a low around 52.

    Low: 52 °F

    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 32. Calm wind.
Sunday
Rain, mainly after 5pm. High near 48. Calm wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Rain, mainly before 9pm. Low around 42. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Rain. High near 56. South wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Rain likely, mainly after 11pm. Cloudy, with a low around 49. South wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Rain. High near 55. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Rain. Low around 51. Chance of precipitation is 100%.
Wednesday
Rain. Cloudy, with a high near 57.
Wednesday Night
Rain. Cloudy, with a low around 52.
Thursday
Rain. Cloudy, with a high near 58.
Thursday Night
Rain. Mostly cloudy, with a low around 50.
Friday
Rain likely. Mostly cloudy, with a high near 60.
Friday Night
A chance of rain. Mostly cloudy, with a low around 47.
Saturday
A chance of rain. Mostly cloudy, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
Mercer Island WA
 47.56°N 122.21°W (Elev. 121 ft)
2:25 am PDT Mar 15, 2026
3am PDT Mar 15, 2026-6pm PDT Mar 21, 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