Early Spring Heat Wave in the Southwest U.S.; Critical Fire Weather in the Central Rockies and Plains

An unusual early Spring heat wave will continue much above-normal temperatures over the Southwest U.S. through early next week. Periods of critical fire weather will persist from the central Rockies to the central Plains through the weekend as gusty winds and low relative humidity continue. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Overcast

55°F

13°C

Humidity 93%
Wind Speed SE 3 MPH
Barometer 30.05 in (1017.61 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 20 Mar 03:00 AM PDT
Extended Forecast for

Newcastle WA

Flood Watch March 20, 03:21am until March 20, 05:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch March 20, 03:21am until March 20, 05:00pm

    NOW until 5:00pm Fri

    Flood Watch

  • Overnight

    Low: 53 °F

    Rain Likely

  • Friday

    Friday: Rain, mainly before 2pm.  High near 56. South southwest wind 11 to 13 mph.  Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain

  • Friday Night

    Friday Night: A chance of rain before 11pm, then a chance of showers between 11pm and 2am.  Mostly cloudy, with a low around 41. Southwest wind 6 to 9 mph becoming northeast in the evening.  Chance of precipitation is 40%.

    Low: 41 °F

    Chance Rain

  • Saturday

    Saturday: A 40 percent chance of showers, mainly before 11am.  Partly sunny, with a high near 49. North wind around 6 mph.

    High: 49 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers.  Partly cloudy, with a low around 38. North wind 6 to 8 mph becoming south after midnight.

    Low: 38 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of rain.  Partly sunny, with a high near 51.

    High: 51 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 53.

    High: 53 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Rain likely. Cloudy, with a low around 53. South wind around 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain, mainly before 2pm. High near 56. South southwest wind 11 to 13 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A chance of rain before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 41. Southwest wind 6 to 9 mph becoming northeast in the evening. Chance of precipitation is 40%.
Saturday
A 40 percent chance of showers, mainly before 11am. Partly sunny, with a high near 49. North wind around 6 mph.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 38. North wind 6 to 8 mph becoming south after midnight.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 38.
Monday
Mostly cloudy, with a high near 53.
Monday Night
A chance of rain after 11pm. Mostly cloudy, with a low around 42.
Tuesday
Rain. Cloudy, with a high near 53.
Tuesday Night
Rain. Mostly cloudy, with a low around 41.
Wednesday
Rain likely. Mostly cloudy, with a high near 50.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 36.
Thursday
A chance of rain. Partly sunny, with a high near 53.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.54°N 122.17°W (Elev. 397 ft)
1:53 am PDT Mar 20, 2026
3am PDT Mar 20, 2026-6pm PDT Mar 26, 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