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

37°F

3°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 16 Apr 03:35 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: A 20 percent chance of rain before 4am. Patchy frost. Otherwise, mostly cloudy, with a low around 35. Light south southeast wind.

    Low: 35 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: Patchy frost before 8am. Otherwise, mostly sunny, with a high near 56. Light and variable wind becoming southwest around 6 mph in the morning.

    High: 56 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 39. South southeast wind 3 to 6 mph.

    Low: 39 °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 41. North northwest wind around 5 mph becoming calm in the evening.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Rain

  • Sunday

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

    High: 66 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A slight chance of rain before 11pm. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain before 4am. Patchy frost. Otherwise, mostly cloudy, with a low around 35. Light south southeast wind.
Thursday
Patchy frost before 8am. Otherwise, mostly sunny, with a high near 56. Light and variable wind becoming southwest around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 39. South southeast wind 3 to 6 mph.
Friday
Mostly sunny, with a high near 57. Light and variable wind.
Friday Night
Mostly cloudy, with a low around 41. North northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 66.
Saturday Night
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 49.
Sunday
A chance of rain. Mostly cloudy, with a high near 66.
Sunday Night
A slight chance of rain before 11pm. Mostly cloudy, with a low around 48.
Monday
A slight chance of rain. Partly sunny, with a high near 67.
Monday Night
A chance of rain. Mostly cloudy, with a low around 49.
Tuesday
A chance of rain. Partly sunny, with a high near 61.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 48.
Wednesday
A chance of rain. Mostly cloudy, with a high near 56.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
1:20 am PDT Apr 16, 2026
Forecast Valid:
3am PDT Apr 16, 2026-6pm PDT Apr 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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