Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

light rain,mist

57°F

14°C

Humidity 89%
Wind Speed NE 5 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 54°F (12°C)
Visibility 4.00 mi
Last update 29 Aug 07:53 AM PDT
Extended Forecast for

Newcastle WA

  • Today

    Today: Rain and thunderstorms likely before 4pm, then a chance of rain.  Mostly cloudy, with a high near 66. South southwest wind around 6 mph becoming calm  in the morning.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 66 °F

    Showers
    Likely then
    Chance Rain

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. Calm wind becoming south 5 to 7 mph in the evening.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 68. South wind around 6 mph becoming calm  in the morning.

    High: 68 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52. Calm wind becoming northeast around 5 mph after midnight.

    Low: 52 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 72. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 72 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 72.

    High: 72 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A chance of rain.  Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance Rain

  • Wednesday

    Wednesday: Rain likely, mainly after 11am.  Cloudy, with a high near 64.

    High: 64 °F

    Rain Likely

Detailed Forecast

Today
Rain and thunderstorms likely before 4pm, then a chance of rain. Mostly cloudy, with a high near 66. South southwest wind around 6 mph becoming calm in the morning. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Mostly cloudy, with a low around 52. Calm wind becoming south 5 to 7 mph in the evening.
Sunday
Mostly cloudy, with a high near 68. South wind around 6 mph becoming calm in the morning.
Sunday Night
Partly cloudy, with a low around 52. Calm wind becoming northeast around 5 mph after midnight.
Monday
Mostly sunny, with a high near 72. Calm wind becoming north northwest around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly cloudy, with a high near 72.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 55.
Wednesday
Rain likely, mainly after 11am. Cloudy, with a high near 64.
Wednesday Night
Rain, mainly before 11pm. Mostly cloudy, with a low around 53.
Thursday
Rain likely. Mostly cloudy, with a high near 64.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 51.
Friday
A chance of rain. Partly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.55°N 122.14°W (Elev. 538 ft)
11:26 pm PDT Aug 28, 2026
8am PDT Aug 29, 2026-6pm PDT Sep 4, 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