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.

Overcast

66°F

19°C

Humidity 32%
Wind Speed N 0 MPH
Barometer 29.89 in (1012.19 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 18 Apr 07:35 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Partly cloudy, with a low around 48. Calm wind becoming east around 5 mph.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. North northeast wind 3 to 7 mph.

    High: 73 °F

    Partly Sunny

  • Sunday Night

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

    Low: 50 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 72. Light and variable wind becoming north northwest around 5 mph in the afternoon.

    High: 72 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 51. West northwest wind around 6 mph becoming south after midnight.

    Low: 51 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain. Mostly cloudy, with a high near 64.

    High: 64 °F

    Chance Rain

  • Tuesday Night

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

    Low: 50 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain. Cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 48. Calm wind becoming east around 5 mph.
Sunday
Partly sunny, with a high near 73. North northeast wind 3 to 7 mph.
Sunday Night
Partly cloudy, with a low around 50. North northeast wind 3 to 7 mph.
Monday
Partly sunny, with a high near 72. Light and variable wind becoming north northwest around 5 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 51. West northwest wind around 6 mph becoming south after midnight.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 64.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 50.
Wednesday
A chance of rain. Cloudy, with a high near 55.
Wednesday Night
A chance of rain before 11pm. Mostly cloudy, with a low around 47.
Thursday
Partly sunny, with a high near 62.
Thursday Night
Mostly clear, with a low around 45.
Friday
Mostly sunny, with a high near 67.
Friday Night
Mostly clear, with a low around 46.
Saturday
Mostly sunny, with a high near 67.
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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:
11:26 am PDT Apr 18, 2026
Forecast Valid:
7pm 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