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.

Fog

34°F

1°C

Humidity 100%
Wind Speed SE 3 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 34°F (1°C)
Visibility 0.25 mi
Last update 31 Dec 05:20 AM PST
Extended Forecast for

Newcastle WA

  • Today

    Today: Mostly sunny, with a high near 46. Southeast wind around 5 mph becoming calm in the morning.

    High: 46 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 35. South southeast wind around 7 mph.

    Low: 35 °F

    Increasing
    Clouds

  • New Year's Day

    New Year's Day: A 30 percent chance of rain after 4pm. Mostly cloudy, with a high near 45. Southeast wind around 6 mph.

    High: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 10pm. Cloudy, with a low around 40. Light east southeast wind. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain Likely

  • Friday

    Friday: Rain likely. Cloudy, with a high near 50. Southeast wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain likely. Mostly cloudy, with a low around 43. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 51. Chance of precipitation is 80%.

    High: 51 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Rain

  • Sunday

    Sunday: Rain likely, mainly before 10am. Mostly cloudy, with a high near 48.

    High: 48 °F

    Rain Likely

Detailed Forecast

Today
Mostly sunny, with a high near 46. Southeast wind around 5 mph becoming calm in the morning.
Tonight
Increasing clouds, with a low around 35. South southeast wind around 7 mph.
New Year's Day
A 30 percent chance of rain after 4pm. Mostly cloudy, with a high near 45. Southeast wind around 6 mph.
Thursday Night
Rain likely, mainly after 10pm. Cloudy, with a low around 40. Light east southeast wind. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain likely. Cloudy, with a high near 50. Southeast wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain likely. Mostly cloudy, with a low around 43. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 51. Chance of precipitation is 80%.
Saturday Night
Rain. Mostly cloudy, with a low around 42.
Sunday
Rain likely, mainly before 10am. Mostly cloudy, with a high near 48.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 40.
Monday
A chance of rain. Mostly cloudy, with a high near 47.
Monday Night
A chance of rain. Mostly cloudy, with a low around 38.
Tuesday
A chance of rain. Mostly cloudy, with a high near 46.
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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:
1:25 am PST Dec 31, 2025
Forecast Valid:
5am PST Dec 31, 2025-6pm PST Jan 6, 2026
 
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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