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

37°F

3°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 30 Dec 06:55 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Partly cloudy, with a low around 35. Light southeast wind.

    Low: 35 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46. Calm wind.

    High: 46 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35. Light east southeast wind.

    Low: 35 °F

    Partly Cloudy

  • New Year's Day

    New Year's Day: A 10 percent chance of rain after 4pm. Mostly cloudy, with a high near 46. Light south southeast wind.

    High: 46 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 4am. Cloudy, with a low around 41. Calm wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 41 °F

    Rain Likely

  • Friday

    Friday: Rain. High near 50. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain

  • Friday Night

    Friday Night: Rain. Low around 42. Chance of precipitation is 80%.

    Low: 42 °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 42.

    Low: 42 °F

    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 35. Light southeast wind.
Wednesday
Mostly sunny, with a high near 46. Calm wind.
Wednesday Night
Partly cloudy, with a low around 35. Light east southeast wind.
New Year's Day
A 10 percent chance of rain after 4pm. Mostly cloudy, with a high near 46. Light south southeast wind.
Thursday Night
Rain likely, mainly after 4am. Cloudy, with a low around 41. Calm wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain. High near 50. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain. Low around 42. Chance of precipitation is 80%.
Saturday
Rain. Mostly cloudy, with a high near 50.
Saturday Night
Rain likely. Mostly cloudy, with a low around 42.
Sunday
Rain likely. Mostly cloudy, with a high near 49.
Sunday Night
Rain likely. Mostly cloudy, with a low around 40.
Monday
A chance of rain. Mostly cloudy, with a high near 48.
Monday Night
A chance of rain. Mostly cloudy, with a low around 38.
Tuesday
A chance of rain. Partly sunny, with a high near 48.
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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 pm PST Dec 30, 2025
Forecast Valid:
7pm PST Dec 30, 2025-6pm PST Jan 6, 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