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.

Partly Cloudy

67°F

19°C

Humidity 56%
Wind Speed S 13 MPH
Barometer 29.82 in (1009.82 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 01 Oct 03:53 PM PDT
Extended Forecast for

Newcastle WA

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm before 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a steady temperature around 63. South wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 63 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers likely, mainly before 11pm. Partly cloudy, with a low around 51. South southeast wind 8 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers before 9am, then a chance of showers after 11am. Partly sunny, with a high near 67. South southwest wind 5 to 8 mph. Chance of precipitation is 40%.

    High: 67 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 50. Calm wind becoming south around 5 mph in the evening.

    Low: 50 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 65. South southeast wind around 5 mph becoming light and variable.

    High: 65 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 11am. Partly sunny, with a high near 62.

    High: 62 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a steady temperature around 63. South wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers likely, mainly before 11pm. Partly cloudy, with a low around 51. South southeast wind 8 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A chance of showers before 9am, then a chance of showers after 11am. Partly sunny, with a high near 67. South southwest wind 5 to 8 mph. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 50. Calm wind becoming south around 5 mph in the evening.
Friday
Partly sunny, with a high near 65. South southeast wind around 5 mph becoming light and variable.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 51.
Saturday
A 20 percent chance of showers before 11am. Partly sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 65.
Sunday Night
Clear, with a low around 45.
Monday
Sunny, with a high near 69.
Monday Night
Clear, with a low around 47.
Tuesday
Sunny, with a high near 71.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
2:25 pm PDT Oct 1, 2025
Forecast Valid:
4pm PDT Oct 1, 2025-6pm PDT Oct 8, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation