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 95%
Wind Speed S 4 MPH
Barometer 30.04 in (1017.27 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 31 Dec 01:53 PM PST
Extended Forecast for

Newcastle WA

  • This Afternoon

    This Afternoon: Patchy fog. Otherwise, mostly sunny, with a high near 46. Calm wind.

    High: 46 °F

    Patchy Fog

  • Tonight

    Tonight: Patchy dense fog. Areas of frost between 9pm and 1am. 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. Light and variable 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 46. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 52. Chance of precipitation is 80%.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Rain

  • Sunday

    Sunday: Rain likely. Mostly cloudy, with a high near 49.

    High: 49 °F

    Rain Likely

Detailed Forecast

This Afternoon
Patchy fog. Otherwise, mostly sunny, with a high near 46. Calm wind.
Tonight
Patchy dense fog. Areas of frost between 9pm and 1am. 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. Light and variable 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 46. 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%.
Saturday Night
Rain. Mostly cloudy, with a low around 44.
Sunday
Rain likely. Mostly cloudy, with a high near 49.
Sunday Night
Rain likely. Mostly cloudy, with a low around 42.
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.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.54°N 122.17°W (Elev. 397 ft)
Last Update:
1:25 pm PST Dec 31, 2025
Forecast Valid:
2pm PST Dec 31, 2025-6pm PST Jan 6, 2026
 
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Additional Resources

Radar & Satellite Image

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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