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

47°F

8°C

Humidity 96%
Wind Speed N 0 MPH
Barometer 29.68 in (1005.08 mb)
Dewpoint 46°F (8°C)
Visibility 8.00 mi
Last update 02 Jan 08:53 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Rain, mainly after 4am. Low around 44. Southeast wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Slight Chance
    Rain then
    Rain

  • Saturday

    Saturday: Rain likely, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 51. South southeast wind 8 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Rain Likely

  • Saturday Night

    Saturday Night: Rain. Low around 44. South southeast wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F

    Rain

  • Sunday

    Sunday: Rain. High near 48. South wind 10 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Rain

  • Sunday Night

    Sunday Night: Rain, mainly before 4am. Low around 39. South wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Rain

  • Monday

    Monday: A 40 percent chance of rain, mainly before 10am. Partly sunny, with a high near 44.

    High: 44 °F

    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after 4am. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.

    Low: 37 °F

    Chance Rain
    then Rain
    Likely

  • Tuesday

    Tuesday: Rain. Cloudy, with a high near 42.

    High: 42 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Rain

Detailed Forecast

Tonight
Rain, mainly after 4am. Low around 44. Southeast wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain likely, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 51. South southeast wind 8 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain. Low around 44. South southeast wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Rain. High near 48. South wind 10 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain, mainly before 4am. Low around 39. South wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
A 40 percent chance of rain, mainly before 10am. Partly sunny, with a high near 44.
Monday Night
Rain likely, mainly after 4am. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.
Tuesday
Rain. Cloudy, with a high near 42.
Tuesday Night
Rain. Mostly cloudy, with a low around 37.
Wednesday
Rain likely. Mostly cloudy, with a high near 43.
Wednesday Night
Rain and snow likely. Mostly cloudy, with a low around 36.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 43.
Thursday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 35.
Friday
A slight chance of rain and snow. Mostly cloudy, with a high near 45.
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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:
7:01 pm PST Jan 2, 2026
Forecast Valid:
9pm PST Jan 2, 2026-6pm PST Jan 9, 2026
 
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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