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

Thunderstorms and Heavy Rainfall in the Southeast, Montana, and Iowa; Lowell Begins to Impact Hawaii

Strong thunderstorms with damaging winds and heavy rain are expected across portions of the Southeast. Thunderstorms may produce large hail across portions of Montana. Heavy rainfall could produce flash flooding across Iowa and vulnerable areas in Utah. Lowell will bring heavy rain, dangerous swells and rip currents to portions of Hawaii. Sweltering heat persists across the South-Central US. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Clear

63°F

17°C

Humidity 67%
Wind Speed NNW 5 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 06 Sep 10:35 AM PDT
Extended Forecast for

Newcastle WA

  • Today

    Today: Mostly sunny, with a high near 70. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 70 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 53. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 53 °F

    Increasing
    Clouds

  • Labor Day

    Labor Day: Mostly cloudy, with a high near 66. South southwest wind 3 to 7 mph.

    High: 66 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 52.

    Low: 52 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 70. Calm wind becoming northwest around 5 mph in the afternoon.
Tonight
Increasing clouds, with a low around 53. Calm wind becoming south 5 to 7 mph after midnight.
Labor Day
Mostly cloudy, with a high near 66. South southwest wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 52. Calm wind.
Tuesday
Mostly sunny, with a high near 70. Calm wind becoming north northwest around 6 mph in the afternoon.
Tuesday Night
Clear, with a low around 52.
Wednesday
Sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Mostly sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 54.
Friday
Partly sunny, with a high near 70.
Friday Night
A slight chance of rain. Partly cloudy, 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 Sep 5, 2026
Forecast Valid:
10am PDT Sep 6, 2026-6pm PDT Sep 12, 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