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

36°F

2°C

Humidity 100%
Wind Speed N 0 MPH
Barometer 30.38 in (1028.79 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 30 Dec 01:35 AM PST
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Partly cloudy, with a low around 34. East northeast wind around 5 mph.

    Low: 34 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 45. East southeast wind around 5 mph becoming calm in the morning.

    High: 45 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 36. South southeast wind 3 to 5 mph.

    Low: 36 °F

    Partly Cloudy

  • Wednesday

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

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 36. Calm wind becoming east southeast around 5 mph in the evening.

    Low: 36 °F

    Partly Cloudy

  • New Year's Day

    New Year's Day: A 30 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 46.

    High: 46 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 10pm. Cloudy, with a low around 40. Chance of precipitation is 60%.

    Low: 40 °F

    Rain Likely

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 48.

    High: 48 °F

    Rain Likely

  • Friday Night

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

    Low: 41 °F

    Rain

Detailed Forecast

Overnight
Partly cloudy, with a low around 34. East northeast wind around 5 mph.
Tuesday
Mostly sunny, with a high near 45. East southeast wind around 5 mph becoming calm in the morning.
Tuesday Night
Partly cloudy, with a low around 36. South southeast wind 3 to 5 mph.
Wednesday
Partly sunny, with a high near 46. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 36. Calm wind becoming east southeast around 5 mph in the evening.
New Year's Day
A 30 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 46.
Thursday Night
Rain likely, mainly after 10pm. Cloudy, with a low around 40. Chance of precipitation is 60%.
Friday
Rain likely. Mostly cloudy, with a high near 48.
Friday Night
Rain. Mostly cloudy, with a low around 41.
Saturday
Rain likely. Mostly cloudy, with a high near 47.
Saturday Night
Rain likely. Mostly cloudy, with a low around 39.
Sunday
A chance of rain. Mostly cloudy, with a high near 46.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 39.
Monday
A chance of rain. Mostly cloudy, with a high near 47.
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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:
1:25 am PST Dec 30, 2025
Forecast Valid:
1am PST Dec 30, 2025-6pm PST Jan 5, 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