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

39°F

4°C

Humidity 93%
Wind Speed S 4 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 31 Dec 03:00 PM PST
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Patchy dense fog. Areas of frost between 2am and 3am. Otherwise, increasing clouds, with a low around 35. Calm wind.

    Low: 35 °F

    Areas Frost
    and Patchy
    Dense Fog

  • New Year's Day

    New Year's Day: A 30 percent chance of rain after 2pm. Patchy dense fog before 10am. Otherwise, cloudy, with a high near 45. Calm wind.

    High: 45 °F

    Chance Rain
    and Patchy
    Dense Fog

  • Thursday Night

    Thursday Night: Rain, mainly after 10pm. Low around 41. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Rain

  • Friday

    Friday: Rain. High near 50. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 50 °F

    Rain

  • Friday Night

    Friday Night: Rain likely. Cloudy, with a low around 45. East wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 45 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 52. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 44. Chance of precipitation is 80%.

    Low: 44 °F

    Rain

  • Sunday

    Sunday: Rain likely. Mostly cloudy, with a high near 50.

    High: 50 °F

    Rain Likely

  • Sunday Night

    Sunday Night: Rain likely. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy dense fog. Areas of frost between 2am and 3am. Otherwise, increasing clouds, with a low around 35. Calm wind.
New Year's Day
A 30 percent chance of rain after 2pm. Patchy dense fog before 10am. Otherwise, cloudy, with a high near 45. Calm wind.
Thursday Night
Rain, mainly after 10pm. Low around 41. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Rain. High near 50. South southeast wind 3 to 5 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain likely. Cloudy, with a low around 45. East wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 52. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Rain. Low around 44. Chance of precipitation is 80%.
Sunday
Rain likely. Mostly cloudy, with a high near 50.
Sunday Night
Rain likely. Mostly cloudy, with a low around 41.
Monday
A chance of rain. Mostly cloudy, with a high near 48.
Monday Night
A chance of rain. Mostly cloudy, with a low around 40.
Tuesday
A chance of rain. Mostly cloudy, with a high near 47.
Tuesday Night
Rain likely. Mostly cloudy, with a low around 39.
Wednesday
Rain likely. Mostly cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.52°N 122.17°W (Elev. 400 ft)
Last Update:
1:25 pm PST Dec 31, 2025
Forecast Valid:
3pm PST Dec 31, 2025-6pm PST Jan 7, 2026
 
Forecast Discussion
 
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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