Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Clear

75°F

24°C

Humidity 53%
Wind Speed N 8 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 19 Aug 02:15 PM PDT
Extended Forecast for

Newcastle WA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 77. Calm wind.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 57. Light and variable wind.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, then gradually becoming sunny, with a high near 80. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 80 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58. Light and variable wind.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 11pm.  Mostly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms.  Mostly cloudy, with a high near 69. Chance of precipitation is 40%.

    High: 69 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 77. Calm wind.
Tonight
Mostly clear, with a low around 57. Light and variable wind.
Thursday
Partly sunny, then gradually becoming sunny, with a high near 80. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 58. Light and variable wind.
Friday
Partly sunny, with a high near 80. Light and variable wind.
Friday Night
A 20 percent chance of showers after 11pm. Mostly cloudy, with a low around 58.
Saturday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 57.
Sunday
Mostly cloudy, with a high near 71.
Sunday Night
Partly cloudy, with a low around 54.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Partly sunny, with a high near 75.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
11:26 am PDT Aug 19, 2026
2pm PDT Aug 19, 2026-6pm PDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database