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Lowell to Impact Hawaii; Heat Persists in the South-Central U.S.

Hurricane Lowell is forecast to pass west of Kauai`s coastal waters tonight. Impacts such as high surf and heavy rain could impact all of the islands. Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley into this week with limited nighttime relief. Periods of moderate to heavy rainfall will be possible through Tuesday morning in the northern Rockies. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Overcast

64°F

18°C

Humidity 67%
Wind Speed W 4 MPH
Barometer 30.15 in (1021.0 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 07 Sep 01:30 PM PDT
Extended Forecast for

Newcastle WA

  • Labor Day

    Labor Day: Partly sunny, with a high near 69. Light west southwest wind.

    High: 69 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 74. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 74 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. North wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Light and variable wind.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 71.

    High: 71 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of rain after 11pm. Partly cloudy, with a low around 54.

    Low: 54 °F

    Slight Chance
    Rain

  • Friday

    Friday: Mostly cloudy, with a high near 69.

    High: 69 °F

    Mostly Cloudy

Detailed Forecast

Labor Day
Partly sunny, with a high near 69. Light west southwest wind.
Tonight
Partly cloudy, with a low around 54. Calm wind.
Tuesday
Sunny, with a high near 74. Calm wind becoming north northwest around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 54. North wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 78. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 71.
Thursday Night
A slight chance of rain after 11pm. Partly cloudy, with a low around 54.
Friday
Mostly cloudy, with a high near 69.
Friday Night
A chance of rain. Mostly cloudy, with a low around 53.
Saturday
A chance of rain. Partly sunny, with a high near 69.
Saturday Night
A slight chance of rain. Partly cloudy, with a low around 53.
Sunday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.56°N 122.18°W (Elev. 207 ft)
Last Update:
12:45 pm PDT Sep 7, 2026
Forecast Valid:
1pm PDT Sep 7, 2026-6pm PDT Sep 13, 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