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

39°F

4°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.21 in (1023.03 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 30 Dec 05:35 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Partly cloudy, with a low around 35. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 35 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46. Light and variable wind.

    High: 46 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 34. Calm wind becoming southeast around 5 mph after midnight.

    Low: 34 °F

    Partly Cloudy

  • New Year's Day

    New Year's Day: A 10 percent chance of rain after 4pm. Mostly cloudy, with a high near 46. East southeast wind around 5 mph becoming calm in the morning.

    High: 46 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 4am. Cloudy, with a low around 40. East southeast wind 3 to 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Rain Likely

  • Friday

    Friday: Rain. High near 48. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 41. Chance of precipitation is 80%.

    Low: 41 °F

    Rain

  • Saturday

    Saturday: Rain. Mostly cloudy, with a high near 49.

    High: 49 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 35. Calm wind becoming south southeast around 5 mph after midnight.
Wednesday
Mostly sunny, with a high near 46. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 34. Calm wind becoming southeast around 5 mph after midnight.
New Year's Day
A 10 percent chance of rain after 4pm. Mostly cloudy, with a high near 46. East southeast wind around 5 mph becoming calm in the morning.
Thursday Night
Rain likely, mainly after 4am. Cloudy, with a low around 40. East southeast wind 3 to 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain. High near 48. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain. Low around 41. Chance of precipitation is 80%.
Saturday
Rain. Mostly cloudy, with a high near 49.
Saturday Night
Rain. Mostly cloudy, with a low around 41.
Sunday
Rain likely. Mostly cloudy, with a high near 47.
Sunday Night
Rain likely. Mostly cloudy, with a low around 38.
Monday
A chance of rain. Mostly cloudy, with a high near 47.
Monday Night
A chance of rain and snow. Mostly cloudy, with a low around 37.
Tuesday
A chance of rain and snow. Partly sunny, with a high near 47.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
1:25 pm PST Dec 30, 2025
Forecast Valid:
5pm PST Dec 30, 2025-6pm PST Jan 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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