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.

Mist

48°F

9°C

Humidity 96%
Wind Speed NNW 5 MPH
Barometer 29.67 in (1004.74 mb)
Dewpoint 47°F (8°C)
Visibility 5.00 mi
Wind Chill46°F (8°C)
Last update 12 Apr 03:53 AM PDT
Extended Forecast for

Newcastle WA

  • Today

    Today: A 10 percent chance of rain after 5pm.  Partly sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.

    High: 61 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Tonight

    Tonight: Rain likely, mainly between 9pm and 11pm.  Increasing clouds, with a low around 47. South wind 5 to 9 mph.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 47 °F

    Rain Likely

  • Monday

    Monday: A 50 percent chance of rain.  Mostly cloudy, with a high near 54. South wind around 9 mph.

    High: 54 °F

    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain.  Mostly cloudy, with a low around 44. Southwest wind around 10 mph.

    Low: 44 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain.  High near 49. South wind 10 to 15 mph, with gusts as high as 26 mph.  Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain.  Low around 39. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Rain then
    Rain Likely

  • Wednesday

    Wednesday: A chance of rain, then showers and possibly a thunderstorm after 11am.  High near 50. Chance of precipitation is 80%.

    High: 50 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm.  Mostly cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain
    then Mostly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
A 10 percent chance of rain after 5pm. Partly sunny, with a high near 61. Calm wind becoming north around 5 mph in the afternoon.
Tonight
Rain likely, mainly between 9pm and 11pm. Increasing clouds, with a low around 47. South wind 5 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
A 50 percent chance of rain. Mostly cloudy, with a high near 54. South wind around 9 mph.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44. Southwest wind around 10 mph.
Tuesday
Rain. High near 49. South wind 10 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Rain. Low around 39. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A chance of rain, then showers and possibly a thunderstorm after 11am. High near 50. Chance of precipitation is 80%.
Wednesday Night
A chance of rain before 11pm. Mostly cloudy, with a low around 37.
Thursday
Mostly sunny, with a high near 54.
Thursday Night
Partly cloudy, with a low around 39.
Friday
Partly sunny, with a high near 56.
Friday Night
Partly cloudy, with a low around 39.
Saturday
Partly sunny, with a high near 60.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.54°N 122.17°W (Elev. 397 ft)
11:27 pm PDT Apr 11, 2026
4am PDT Apr 12, 2026-6pm PDT Apr 18, 2026
 
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