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

71°F

22°C

Humidity 54%
Wind Speed SW 6 MPH
Barometer 29.77 in (1008.13 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 28 Sep 02:53 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: A 20 percent chance of rain after 2am. Mostly cloudy, with a low around 60. Light and variable wind becoming south southeast 5 to 9 mph in the evening.

    Low: 60 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Monday

    Monday: Rain, mainly before 5pm, then showers and possibly a thunderstorm after 5pm. Widespread haze before 11am. Steady temperature around 62. South southwest wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 8pm, then rain, mainly between 8pm and 11pm. Low around 53. South southeast wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Showers then
    Chance Rain

  • Tuesday

    Tuesday: Rain likely, mainly after 11am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 68. South southeast wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 68 °F

    Rain Likely
    and Patchy
    Fog

  • Tuesday Night

    Tuesday Night: Rain. Low around 54. South southeast wind 7 to 11 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Rain

  • Wednesday

    Wednesday: Rain before 11am, then showers and possibly a thunderstorm after 11am. High near 65. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 65 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 11pm, then rain after 11pm. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Thursday

    Thursday: Rain. Mostly cloudy, with a high near 64.

    High: 64 °F

    Rain

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Showers
    Likely

Detailed Forecast

Tonight
A 20 percent chance of rain after 2am. Mostly cloudy, with a low around 60. Light and variable wind becoming south southeast 5 to 9 mph in the evening.
Monday
Rain, mainly before 5pm, then showers and possibly a thunderstorm after 5pm. Widespread haze before 11am. Steady temperature around 62. South southwest wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and possibly a thunderstorm before 8pm, then rain, mainly between 8pm and 11pm. Low around 53. South southeast wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Rain likely, mainly after 11am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 68. South southeast wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
Rain. Low around 54. South southeast wind 7 to 11 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Rain before 11am, then showers and possibly a thunderstorm after 11am. High near 65. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 11pm, then rain after 11pm. Low around 53. Chance of precipitation is 80%.
Thursday
Rain. Mostly cloudy, with a high near 64.
Thursday Night
Showers likely and possibly a thunderstorm before 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 52.
Friday
Rain likely. Mostly cloudy, with a high near 64.
Friday Night
A chance of rain. Mostly cloudy, with a low around 50.
Saturday
A chance of rain. Partly sunny, with a high near 62.
Saturday Night
A slight chance of rain. Partly cloudy, with a low around 47.
Sunday
Mostly sunny, with a high near 63.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.55°N 122.14°W (Elev. 538 ft)
Last Update:
2:25 pm PDT Sep 28, 2025
Forecast Valid:
3pm PDT Sep 28, 2025-6pm PDT Oct 5, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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