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

Showers and Thunderstorms for the Eastern Third of the Country; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

Showers and thunderstorms will continue along and ahead of a cold front for the eastern third of the country. The rainfall for the Great Lakes region could prolong the ongoing flooding. Much cooler weather will filter in behind this cold front along and east of the Rockies. Where the rain is needed, the Southern High Plains, critical fire weather concerns through this weekend. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Partly Cloudy

63°F

17°C

Humidity 45%
Wind Speed N 0 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 18 Apr 08:35 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Partly cloudy, with a low around 48. Light and variable wind becoming east northeast around 5 mph in the evening.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 72. Northeast wind 5 to 7 mph.

    High: 72 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 50. Northeast wind 3 to 7 mph.

    Low: 50 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 70. Light and variable wind becoming north northwest around 5 mph in the afternoon.

    High: 70 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 50. West northwest wind around 6 mph becoming south after midnight.

    Low: 50 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain. Mostly cloudy, with a high near 62.

    High: 62 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance Rain

  • Wednesday

    Wednesday: Rain likely, mainly before 11am. Mostly cloudy, with a high near 54.

    High: 54 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 48. Light and variable wind becoming east northeast around 5 mph in the evening.
Sunday
Partly sunny, with a high near 72. Northeast wind 5 to 7 mph.
Sunday Night
Partly cloudy, with a low around 50. Northeast wind 3 to 7 mph.
Monday
Partly sunny, with a high near 70. Light and variable wind becoming north northwest around 5 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 50. West northwest wind around 6 mph becoming south after midnight.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 62.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 48.
Wednesday
Rain likely, mainly before 11am. Mostly cloudy, with a high near 54.
Wednesday Night
A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 45.
Thursday
Partly sunny, with a high near 60.
Thursday Night
Mostly clear, with a low around 44.
Friday
Mostly sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 45.
Saturday
Mostly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
11:26 am PDT Apr 18, 2026
Forecast Valid:
8pm PDT Apr 18, 2026-6pm PDT Apr 25, 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