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.

Overcast

45°F

7°C

Humidity 93%
Wind Speed N 3 MPH
Barometer 30.35 in (1027.77 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 03 Dec 12:20 AM PST
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Mostly cloudy, with a low around 36. Calm wind.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 44. Calm wind.

    High: 44 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 10pm. Mostly cloudy, with a low around 39. Light south southeast wind.

    Low: 39 °F

    Chance Rain

  • Thursday

    Thursday: Rain. High near 45. South southeast wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 45 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 43. South southeast wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 43 °F

    Rain

  • Friday

    Friday: Rain. High near 51. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 51 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 46. Chance of precipitation is 80%.

    Low: 46 °F

    Rain

  • Saturday

    Saturday: Rain. Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 36. Calm wind.
Wednesday
Mostly cloudy, with a high near 44. Calm wind.
Wednesday Night
A 30 percent chance of rain after 10pm. Mostly cloudy, with a low around 39. Light south southeast wind.
Thursday
Rain. High near 45. South southeast wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain. Low around 43. South southeast wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. High near 51. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain. Low around 46. Chance of precipitation is 80%.
Saturday
Rain. Mostly cloudy, with a high near 50.
Saturday Night
Rain likely. Mostly cloudy, with a low around 45.
Sunday
Rain. Cloudy, with a high near 51.
Sunday Night
Rain likely. Mostly cloudy, with a low around 45.
Monday
Rain likely. Cloudy, with a high near 53.
Monday Night
Rain. Cloudy, with a low around 47.
Tuesday
Rain. Cloudy, with a high near 51.
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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:
7:01 pm PST Dec 2, 2025
Forecast Valid:
12am PST Dec 3, 2025-6pm PST Dec 9, 2025
 
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