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.

Overcast

55°F

13°C

Humidity 71%
Wind Speed N 0 MPH
Barometer 29.73 in (1006.77 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 11 Apr 04:35 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after 4pm. Partly sunny, with a high near 60. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 60 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 47. West northwest wind 5 to 9 mph becoming south after midnight.

    Low: 47 °F

    Chance Rain

  • Monday

    Monday: A 50 percent chance of rain. Mostly cloudy, with a high near 53. South wind around 9 mph.

    High: 53 °F

    Chance Rain

  • Monday Night

    Monday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 44. South wind 9 to 11 mph.

    Low: 44 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain, mainly after 11am. High near 50. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 39. Chance of precipitation is 90%.

    Low: 39 °F

    Rain then
    Rain Likely

  • Wednesday

    Wednesday: A chance of rain, then showers likely and possibly a thunderstorm after 11am. Partly sunny, with a high near 51.

    High: 51 °F

    Showers
    Likely

  • 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

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. Calm wind.
Sunday
A 20 percent chance of rain after 4pm. Partly sunny, with a high near 60. Calm wind becoming north northwest around 5 mph in the afternoon.
Sunday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 47. West northwest wind 5 to 9 mph becoming south after midnight.
Monday
A 50 percent chance of rain. Mostly cloudy, with a high near 53. South wind around 9 mph.
Monday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 44. South wind 9 to 11 mph.
Tuesday
Rain, mainly after 11am. High near 50. 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 90%.
Wednesday
A chance of rain, then showers likely and possibly a thunderstorm after 11am. Partly sunny, with a high near 51.
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
Mostly cloudy, with a low around 39.
Friday
Partly sunny, with a high near 56.
Friday Night
Partly cloudy, with a low around 40.
Saturday
A chance of rain. Mostly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

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