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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Partly Cloudy

75°F

24°C

Humidity 50%
Wind Speed SW 6 MPH
Barometer 30.0 in (1015.92 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 22 Aug 05:20 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: A 10 percent chance of rain after 4am. Increasing clouds, with a low around 59. West wind around 6 mph becoming light and variable.

    Low: 59 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 75. South wind around 5 mph becoming calm in the afternoon.

    High: 75 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. Calm wind becoming north northeast around 6 mph in the evening.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 78. North wind 5 to 8 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. North wind 5 to 8 mph becoming calm after midnight.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 10 percent chance of rain after 4am. Increasing clouds, with a low around 59. West wind around 6 mph becoming light and variable.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 75. South wind around 5 mph becoming calm in the afternoon.
Sunday Night
Partly cloudy, with a low around 56. Calm wind becoming north northeast around 6 mph in the evening.
Monday
Sunny, with a high near 78. North wind 5 to 8 mph.
Monday Night
Mostly clear, with a low around 58. North wind 5 to 8 mph becoming calm after midnight.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Partly sunny, with a high near 75.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
A slight chance of rain before 11am. Partly sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Partly sunny, with a high near 73.
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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:
11:26 am PDT Aug 22, 2026
Forecast Valid:
5pm PDT Aug 22, 2026-6pm PDT Aug 29, 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