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

46°F

8°C

Humidity 81%
Wind Speed N 0 MPH
Barometer 30.34 in (1027.43 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 03 Dec 07:35 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Rain likely, mainly after 3am. Mostly cloudy, with a low around 39. Calm wind becoming south southeast around 5 mph after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Mostly Cloudy
    then Rain
    Likely

  • Thursday

    Thursday: Rain, mainly before 3pm. High near 45. South wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 45 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Temperature rising to around 47 by 3am. South wind 5 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F⇑

    Rain

  • Friday

    Friday: Rain. High near 52. South southwest wind around 11 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 52 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 45. South southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Rain

  • Saturday

    Saturday: Rain. High near 49. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Rain

  • Saturday Night

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

    Low: 46 °F

    Rain

  • Sunday

    Sunday: Rain. Cloudy, with a high near 52.

    High: 52 °F

    Rain

  • Sunday Night

    Sunday Night: Rain, mainly before 10pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Rain

Detailed Forecast

Tonight
Rain likely, mainly after 3am. Mostly cloudy, with a low around 39. Calm wind becoming south southeast around 5 mph after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Rain, mainly before 3pm. High near 45. South wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Rain. Temperature rising to around 47 by 3am. South wind 5 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 52. South southwest wind around 11 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain. Low around 45. South southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Rain. High near 49. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain. Low around 46. Chance of precipitation is 80%.
Sunday
Rain. Cloudy, with a high near 52.
Sunday Night
Rain, mainly before 10pm. Mostly cloudy, with a low around 47.
Monday
Rain. Cloudy, with a high near 53.
Monday Night
Rain. Cloudy, with a low around 48.
Tuesday
Rain. Cloudy, with a high near 53.
Tuesday Night
Rain. Cloudy, with a low around 44.
Wednesday
Rain. Cloudy, with a high near 49.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
7:00 pm PST Dec 3, 2025
Forecast Valid:
7pm PST Dec 3, 2025-6pm PST Dec 10, 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