National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hawaii and Guam Concerns; Record Warmth Spreads Eastward; Heavy Snow for Sierra-Nevada; Severe Weather for the Plains

A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

Lat: 47.49509°NLon: 122.21437°WElev: 23.0ft.

Clear

57°F

14°C

Humidity 62%
Wind Speed N 5 MPH
Barometer 29.81 in (1009.48 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 10 Apr 11:30 AM PDT
Extended Forecast for

Newcastle WA

  • Today

    Today: Mostly sunny, with a high near 69. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of rain, mainly after 4am. Mostly cloudy, with a low around 49. Calm wind becoming south around 5 mph after midnight.

    Low: 49 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: Rain, mainly before 1pm. High near 55. South southwest wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 55 °F

    Rain

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before 11pm. Mostly cloudy, with a low around 46. Light and variable wind.

    Low: 46 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 59. Calm wind becoming west around 5 mph in the afternoon.

    High: 59 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

  • Monday

    Monday: A 40 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Monday Night

    Monday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain, mainly after 11am. Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain

Detailed Forecast

Today
Mostly sunny, with a high near 69. Calm wind becoming northwest around 5 mph in the afternoon.
Tonight
A 30 percent chance of rain, mainly after 4am. Mostly cloudy, with a low around 49. Calm wind becoming south around 5 mph after midnight.
Saturday
Rain, mainly before 1pm. High near 55. South southwest wind 5 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
A 20 percent chance of rain before 11pm. Mostly cloudy, with a low around 46. Light and variable wind.
Sunday
A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 59. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
Monday Night
A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 44.
Tuesday
Rain, mainly after 11am. Mostly cloudy, with a high near 50.
Tuesday Night
Rain. Mostly cloudy, with a low around 39.
Wednesday
Rain likely. Mostly cloudy, with a high near 51.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 37.
Thursday
Mostly sunny, with a high near 54.
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:
11:27 am PDT Apr 10, 2026
Forecast Valid:
11am PDT Apr 10, 2026-6pm PDT Apr 16, 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