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.

Rain

38°F

3°C

Humidity 92%
Wind Speed SE 3 MPH
Barometer 30.04 in (1017.27 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 15 Apr 10:53 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: A 20 percent chance of showers before midnight. Patchy frost after 2am. Otherwise, mostly cloudy, with a low around 36. Light south southeast wind.

    Low: 36 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Patchy frost before 8am. Otherwise, mostly sunny, with a high near 56. South southwest wind 3 to 6 mph.

    High: 56 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 40. Southwest wind around 6 mph.

    Low: 40 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 57. Light and variable wind.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 42. North northwest wind around 5 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of rain. Mostly cloudy, with a high near 66.

    High: 66 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers before midnight. Patchy frost after 2am. Otherwise, mostly cloudy, with a low around 36. Light south southeast wind.
Thursday
Patchy frost before 8am. Otherwise, mostly sunny, with a high near 56. South southwest wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 40. Southwest wind around 6 mph.
Friday
Mostly sunny, with a high near 57. Light and variable wind.
Friday Night
Mostly cloudy, with a low around 42. North northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 65.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
A slight chance of rain. Mostly cloudy, with a high near 66.
Sunday Night
Mostly cloudy, with a low around 48.
Monday
Partly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
A slight chance of rain. Partly sunny, with a high near 64.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 49.
Wednesday
A chance of rain. Mostly cloudy, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
2:10 pm PDT Apr 15, 2026
Forecast Valid:
11pm PDT Apr 15, 2026-6pm PDT Apr 22, 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