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

65°F

18°C

Humidity 70%
Wind Speed S 6 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 23 Aug 12:53 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 61. South wind around 6 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. South wind around 5 mph becoming calm in the afternoon.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 54. North northeast wind 3 to 7 mph.

    Low: 54 °F

    Mostly Clear

  • Monday

    Monday: Patchy smoke after 1pm. Sunny, with a high near 77. North wind 6 to 8 mph.

    High: 77 °F

    Mostly Sunny
    then Patchy
    Smoke

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. Northeast wind 3 to 8 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

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

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 61. South wind around 6 mph.
Sunday
Partly sunny, with a high near 73. South wind around 5 mph becoming calm in the afternoon.
Sunday Night
Mostly clear, with a low around 54. North northeast wind 3 to 7 mph.
Monday
Patchy smoke after 1pm. Sunny, with a high near 77. North wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 56. Northeast wind 3 to 8 mph.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly cloudy, with a high near 72.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 72.
Friday Night
Mostly clear, with a low around 53.
Saturday
Mostly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
11:26 pm PDT Aug 22, 2026
Forecast Valid:
1am PDT Aug 23, 2026-6pm PDT Aug 29, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation