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

61°F

16°C

Humidity 82%
Wind Speed SSE 3 MPH
Barometer 29.81 in (1009.48 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 14 Sep 03:20 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: A 50 percent chance of showers, mainly after 4am. Mostly cloudy, with a steady temperature around 60. South southeast wind around 7 mph.

    Low: 60 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers, mainly before 3pm. Patchy fog between 10am and 1pm. High near 63. South wind around 6 mph becoming east northeast in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 50. East northeast wind around 6 mph becoming light and variable after midnight.

    Low: 50 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 68. Calm wind becoming north around 6 mph in the afternoon.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 53. Northeast wind around 6 mph.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 57.

    Low: 57 °F

    Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Partly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers, mainly after 4am. Mostly cloudy, with a steady temperature around 60. South southeast wind around 7 mph.
Sunday
Showers, mainly before 3pm. Patchy fog between 10am and 1pm. High near 63. South wind around 6 mph becoming east northeast in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers, mainly before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 50. East northeast wind around 6 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 68. Calm wind becoming north around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 53. Northeast wind around 6 mph.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Clear, with a low around 57.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 50.
Friday
Mostly sunny, with a high near 69.
Friday Night
Mostly clear, with a low around 53.
Saturday
A slight chance of showers. Mostly sunny, with a high near 72.
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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 am PDT Sep 14, 2025
Forecast Valid:
3am PDT Sep 14, 2025-6pm PDT Sep 20, 2025
 
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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