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

Renton Municipal Airport (KRNT)

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

Clear

63°F

17°C

Humidity 72%
Wind Speed N 0 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 08 Oct 07:00 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Increasing clouds, with a low around 53. Light and variable wind becoming south 6 to 11 mph after midnight. Winds could gust as high as 20 mph.

    Low: 53 °F

    Increasing
    Clouds

  • Friday

    Friday: Rain, mainly before 10am. High near 61. South southwest wind 8 to 13 mph becoming light and variable in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly between 7pm and midnight. Mostly cloudy, with a low around 47. Light and variable wind becoming south 5 to 7 mph in the evening.

    Low: 47 °F

    Chance Rain
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 11am. Partly sunny, with a high near 58. South wind around 6 mph becoming calm.

    High: 58 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 43. North wind around 6 mph becoming calm in the evening.

    Low: 43 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 53. Light and variable wind becoming south 6 to 11 mph after midnight. Winds could gust as high as 20 mph.
Friday
Rain, mainly before 10am. High near 61. South southwest wind 8 to 13 mph becoming light and variable in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 50 percent chance of rain, mainly between 7pm and midnight. Mostly cloudy, with a low around 47. Light and variable wind becoming south 5 to 7 mph in the evening.
Saturday
A 20 percent chance of rain before 11am. Partly sunny, with a high near 58. South wind around 6 mph becoming calm.
Saturday Night
Partly cloudy, with a low around 43. North wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 61.
Sunday Night
Mostly clear, with a low around 41.
Columbus Day
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
A slight chance of rain. Partly sunny, with a high near 61.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 48.
Wednesday
A slight chance of rain. Partly sunny, with a high near 61.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
12:25 pm PDT Oct 8, 2026
Forecast Valid:
7pm PDT Oct 8, 2026-6pm PDT Oct 15, 2026
 
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Additional Resources

Radar & Satellite Image

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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