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.

Overcast

62°F

17°C

Humidity 77%
Wind Speed S 3 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Sep 12:53 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 59. Light south southeast wind.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 72. Light and variable wind.

    High: 72 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. Calm wind becoming north northeast around 5 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 76. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers after 11pm. Mostly cloudy, with a low around 58. South wind 3 to 7 mph.

    Low: 58 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 66 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    Showers

  • Monday

    Monday: A slight chance of showers before 11am. Partly sunny, with a high near 67.

    High: 67 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 59. Light south southeast wind.
Friday
Partly sunny, with a high near 72. Light and variable wind.
Friday Night
Partly cloudy, with a low around 56. Calm wind becoming north northeast around 5 mph.
Saturday
Mostly sunny, with a high near 76. Calm wind becoming west southwest around 5 mph in the afternoon.
Saturday Night
A 40 percent chance of showers after 11pm. Mostly cloudy, with a low around 58. South wind 3 to 7 mph.
Sunday
Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 55.
Monday
A slight chance of showers before 11am. Partly sunny, with a high near 67.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 72.
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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:
8:01 pm PDT Sep 11, 2025
Forecast Valid:
1am PDT Sep 12, 2025-6pm PDT Sep 18, 2025
 
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