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

Renton Municipal Airport (KRNT)

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

Clear

41°F

5°C

Humidity 75%
Wind Speed N 3 MPH
Barometer 30.63 in (1037.25 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 28 Dec 05:00 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: A slight chance of rain between 7pm and 8pm. Mostly cloudy, with a low around 34. Calm wind. Chance of precipitation is 20%.

    Low: 34 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 46. Light and variable wind.

    High: 46 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34. Light east northeast wind.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 47. Light east wind.

    High: 47 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. Light southeast wind.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: A slight chance of rain after 10am. Mostly cloudy, with a high near 49.

    High: 49 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain. Cloudy, with a low around 41.

    Low: 41 °F

    Chance Rain

Detailed Forecast

Tonight
A slight chance of rain between 7pm and 8pm. Mostly cloudy, with a low around 34. Calm wind. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 46. Light and variable wind.
Monday Night
Mostly cloudy, with a low around 34. Light east northeast wind.
Tuesday
Partly sunny, with a high near 47. Light east wind.
Tuesday Night
Mostly cloudy, with a low around 36. Light southeast wind.
Wednesday
Partly sunny, with a high near 47.
Wednesday Night
Mostly cloudy, with a low around 38.
New Year's Day
A slight chance of rain after 10am. Mostly cloudy, with a high near 49.
Thursday Night
A chance of rain. Cloudy, with a low around 41.
Friday
A chance of rain. Mostly cloudy, with a high near 48.
Friday Night
A chance of rain. Mostly cloudy, with a low around 40.
Saturday
A chance of rain. Mostly cloudy, with a high near 47.
Saturday Night
A chance of rain and snow. Mostly cloudy, with a low around 38.
Sunday
A chance of rain and snow. Partly sunny, with a high near 47.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.54°N 122.17°W (Elev. 397 ft)
Last Update:
1:25 pm PST Dec 28, 2025
Forecast Valid:
5pm PST Dec 28, 2025-6pm PST Jan 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation