National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

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 >

Hazardous Weather Conditions

Current conditions at

Renton Municipal Airport (KRNT)

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

Mostly Cloudy

48°F

9°C

Humidity 61%
Wind Speed NNW 4 MPH
Barometer 30.3 in (1026.08 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 21 Mar 03:15 PM PDT
Extended Forecast for

Newcastle WA

Flood Warning March 21, 03:32pm until March 21, 11:00pm
Click here for hazard details and duration
...
  •  
    Flood Warning March 21, 03:32pm until March 21, 11:00pm

    NOW until 11:00pm Sat

    Flood Warning

  • Tonight

    Low: 38 °F

    Gradual
    Clearing

  • Sunday

    Sunday: Partly sunny, with a high near 52. Light and variable wind becoming north northwest around 6 mph in the afternoon.

    High: 52 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 36. North wind 3 to 6 mph.

    Low: 36 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 52. North northwest wind 3 to 7 mph.

    High: 52 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of rain after 11pm. Cloudy, with a low around 42. North northwest wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain. High near 53. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 53 °F

    Rain

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 11pm, then a chance of rain after 11pm. Low around 41. Chance of precipitation is 80%.

    Low: 41 °F

    Showers then
    Chance Rain

  • Wednesday

    Wednesday: Rain. Mostly cloudy, with a high near 51.

    High: 51 °F

    Rain

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 38. Light and variable wind becoming south 5 to 7 mph in the evening.
Sunday
Partly sunny, with a high near 52. Light and variable wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 36. North wind 3 to 6 mph.
Monday
Partly sunny, with a high near 52. North northwest wind 3 to 7 mph.
Monday Night
A 40 percent chance of rain after 11pm. Cloudy, with a low around 42. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Rain. High near 53. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm before 11pm, then a chance of rain after 11pm. Low around 41. Chance of precipitation is 80%.
Wednesday
Rain. Mostly cloudy, with a high near 51.
Wednesday Night
Rain likely, mainly before 11pm. Mostly cloudy, with a low around 37.
Thursday
A chance of rain. Partly sunny, with a high near 52.
Thursday Night
A slight chance of rain. Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 55.
Friday Night
Partly cloudy, with a low around 38.
Saturday
A slight chance of rain. Mostly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
2:01 pm PDT Mar 21, 2026
Forecast Valid:
3pm PDT Mar 21, 2026-6pm PDT Mar 28, 2026
 
Forecast Discussion
 
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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