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.

Mostly Cloudy

43°F

6°C

Humidity 86%
Wind Speed S 6 MPH
Barometer 30.24 in (1024.04 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 21 Nov 08:20 AM PST
Extended Forecast for

Newcastle WA

  • Today

    Today: Mostly cloudy, with a high near 52. South wind around 5 mph.

    High: 52 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 20 percent chance of rain after 1am. Mostly cloudy, with a steady temperature around 49. South southeast wind around 7 mph.

    Low: 49 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A slight chance of rain before 10am, then a slight chance of rain after 4pm. Mostly cloudy, with a high near 55. South wind around 6 mph. Chance of precipitation is 20%.

    High: 55 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain, mainly after 10pm. Cloudy, with a low around 48. South wind around 7 mph.

    Low: 48 °F

    Chance Rain

  • Sunday

    Sunday: Rain. High near 51. South southwest wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 51 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Low around 40. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Rain

  • Monday

    Monday: Rain likely, mainly before 10am. Partly sunny, with a high near 48. Chance of precipitation is 60%.

    High: 48 °F

    Rain Likely
    then Chance
    Rain

  • Monday Night

    Monday Night: A slight chance of rain after 4am. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: A chance of rain, mainly after 10am. Mostly cloudy, with a high near 46.

    High: 46 °F

    Chance Rain

Detailed Forecast

Today
Mostly cloudy, with a high near 52. South wind around 5 mph.
Tonight
A 20 percent chance of rain after 1am. Mostly cloudy, with a steady temperature around 49. South southeast wind around 7 mph.
Saturday
A slight chance of rain before 10am, then a slight chance of rain after 4pm. Mostly cloudy, with a high near 55. South wind around 6 mph. Chance of precipitation is 20%.
Saturday Night
A 50 percent chance of rain, mainly after 10pm. Cloudy, with a low around 48. South wind around 7 mph.
Sunday
Rain. High near 51. South southwest wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain. Low around 40. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain likely, mainly before 10am. Partly sunny, with a high near 48. Chance of precipitation is 60%.
Monday Night
A slight chance of rain after 4am. Mostly cloudy, with a low around 37.
Tuesday
A chance of rain, mainly after 10am. Mostly cloudy, with a high near 46.
Tuesday Night
Rain likely, mainly after 10pm. Cloudy, with a low around 41.
Wednesday
Rain likely. Cloudy, with a high near 48.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 44.
Thanksgiving Day
Rain likely. Mostly cloudy, with a high near 52.
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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:
7:00 am PST Nov 21, 2025
Forecast Valid:
8am PST Nov 21, 2025-6pm PST Nov 27, 2025
 
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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