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

57°F

14°C

Humidity 58%
Wind Speed N 4 MPH
Barometer 30.16 in (1021.34 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 05 Oct 08:20 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Clear, with a low around 45. North northeast wind 3 to 6 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 70. North wind 5 to 7 mph.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48. North wind around 6 mph becoming east after midnight.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 71. East wind around 6 mph becoming calm in the morning.

    High: 71 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 48. Light and variable wind becoming south around 5 mph after midnight.

    Low: 48 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 61.

    High: 61 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 11pm. Partly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers before 11am. Partly sunny, with a high near 66.

    High: 66 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers after 11pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 45. North northeast wind 3 to 6 mph.
Monday
Sunny, with a high near 70. North wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 48. North wind around 6 mph becoming east after midnight.
Tuesday
Sunny, with a high near 71. East wind around 6 mph becoming calm in the morning.
Tuesday Night
Partly cloudy, with a low around 48. Light and variable wind becoming south around 5 mph after midnight.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 61.
Wednesday Night
A 20 percent chance of showers after 11pm. Partly cloudy, with a low around 47.
Thursday
A slight chance of showers before 11am. Partly sunny, with a high near 66.
Thursday Night
A slight chance of showers after 11pm. Mostly cloudy, with a low around 49.
Friday
A chance of showers, mainly after 11am. Partly sunny, with a high near 64.
Friday Night
A chance of showers. Mostly cloudy, with a low around 50.
Saturday
Showers likely. Mostly cloudy, with a high near 58.
Saturday Night
Showers likely. Mostly cloudy, with a low around 47.
Sunday
Showers likely. Mostly cloudy, with a high near 57.
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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:
8:01 pm PDT Oct 5, 2025
Forecast Valid:
8pm PDT Oct 5, 2025-6pm PDT Oct 12, 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