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Sinlaku Continues to Impact the Marianas; Severe Weather from the Central US to the Northeast; Late-Season Snow in the Northwest

Sinlaku continues to bring destructive winds, widespread heavy rain/flooding, and storm surge to the Marianas. Showers and severe thunderstorms are expected from the Northeast to the Mid-Mississippi Valley and to the Central/Southern Plains through Thursday. A front will produce late-season snowfall over the Cascades and Northern Rockies and coastal rain over the Northwest Coast through Thursday. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Rain

43°F

6°C

Humidity 86%
Wind Speed NE 8 MPH
Barometer 29.79 in (1008.81 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 15 Apr 02:35 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 39. Southeast wind around 6 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain and snow showers before noon, then rain showers. Some thunder is also possible. High near 47. South southeast wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 47 °F

    Chance
    Rain/Snow
    then Showers

  • Wednesday Night

    Wednesday Night: Rain and thunderstorms likely before 10pm, then a slight chance of rain between 10pm and 11pm. Mostly cloudy, with a low around 34. West southwest wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 34 °F

    Rain Likely
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 54. Southwest wind around 6 mph.

    High: 54 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 39. South wind around 6 mph.

    Low: 39 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 63.

    High: 63 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 39. Southeast wind around 6 mph.
Wednesday
A chance of rain and snow showers before noon, then rain showers. Some thunder is also possible. High near 47. South southeast wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.
Wednesday Night
Rain and thunderstorms likely before 10pm, then a slight chance of rain between 10pm and 11pm. Mostly cloudy, with a low around 34. West southwest wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Mostly sunny, with a high near 54. Southwest wind around 6 mph.
Thursday Night
Mostly cloudy, with a low around 39. South wind around 6 mph.
Friday
Partly sunny, with a high near 55.
Friday Night
Mostly cloudy, with a low around 40.
Saturday
Mostly cloudy, with a high near 63.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 46.
Sunday
A chance of rain. Mostly cloudy, with a high near 63.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 47.
Monday
A slight chance of rain. Mostly sunny, with a high near 65.
Monday Night
A slight chance of rain. Partly cloudy, with a low around 47.
Tuesday
A slight chance of rain. Mostly sunny, with a high near 64.
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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:
1:16 am PDT Apr 15, 2026
Forecast Valid:
2am PDT Apr 15, 2026-6pm PDT Apr 21, 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