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.

Clear

48°F

9°C

Humidity 81%
Wind Speed N 0 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 19 Apr 03:20 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Mostly cloudy, with a low around 49. East southeast wind around 5 mph.

    Low: 49 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. Northeast wind 3 to 6 mph.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 50. North northwest wind around 5 mph becoming calm.

    Low: 50 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 71. Northeast wind around 5 mph becoming west northwest in the afternoon.

    High: 71 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 49. West wind 6 to 8 mph becoming south in the evening.

    Low: 49 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 60.

    High: 60 °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: A chance of rain. Mostly cloudy, with a high near 53.

    High: 53 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A slight chance of rain. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Slight Chance
    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 49. East southeast wind around 5 mph.
Sunday
Partly sunny, with a high near 73. Northeast wind 3 to 6 mph.
Sunday Night
Partly cloudy, with a low around 50. North northwest wind around 5 mph becoming calm.
Monday
Mostly cloudy, with a high near 71. Northeast wind around 5 mph becoming west northwest in the afternoon.
Monday Night
Partly cloudy, with a low around 49. West wind 6 to 8 mph becoming south in the evening.
Tuesday
A 40 percent chance of rain, mainly after 11am. Mostly cloudy, with a high near 60.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 48.
Wednesday
A chance of rain. Mostly cloudy, with a high near 53.
Wednesday Night
A slight chance of rain. Mostly cloudy, with a low around 45.
Thursday
Partly sunny, with a high near 60.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Sunny, with a high near 64.
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 pm PDT Apr 18, 2026
Forecast Valid:
3am PDT Apr 19, 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