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.

Mist

34°F

1°C

Humidity 100%
Wind Speed S 5 MPH
Barometer 29.62 in (1003.05 mb)
Dewpoint 34°F (1°C)
Visibility 1.75 mi
Wind Chill29°F (-2°C)
Last update 26 Dec 06:10 AM PST
Extended Forecast for

Newcastle WA

  • Today

    Today: Rain. High near 44. South southeast wind 7 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 44 °F

    Rain then
    Rain Likely

  • Tonight

    Tonight: Rain likely, mainly before 2am. Mostly cloudy, with a low around 34. Southwest wind 6 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 34 °F

    Rain Likely

  • Saturday

    Saturday: Mostly sunny, with a high near 40. Southwest wind around 5 mph becoming northwest in the afternoon.

    High: 40 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 33. Light east southeast wind.

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 42. Light southeast wind.

    High: 42 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

Detailed Forecast

Today
Rain. High near 44. South southeast wind 7 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Rain likely, mainly before 2am. Mostly cloudy, with a low around 34. Southwest wind 6 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Mostly sunny, with a high near 40. Southwest wind around 5 mph becoming northwest in the afternoon.
Saturday Night
Mostly cloudy, with a low around 33. Light east southeast wind.
Sunday
Partly sunny, with a high near 42. Light southeast wind.
Sunday Night
Mostly cloudy, with a low around 33.
Monday
Mostly cloudy, with a high near 45.
Monday Night
Mostly cloudy, with a low around 34.
Tuesday
Mostly cloudy, with a high near 46.
Tuesday Night
A slight chance of rain after 10pm. Mostly cloudy, with a low around 38.
Wednesday
A chance of rain. Cloudy, with a high near 47.
Wednesday Night
A chance of rain. Cloudy, with a low around 40.
New Year's Day
Rain likely. Mostly cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
3:01 am PST Dec 26, 2025
Forecast Valid:
6am PST Dec 26, 2025-6pm PST Jan 1, 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