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

37°F

3°C

Humidity 93%
Wind Speed S 3 MPH
Barometer 30.07 in (1018.29 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 16 Apr 12:20 AM PDT
Extended Forecast for

Newcastle WA

  • Overnight

    Overnight: A slight chance of rain and snow before 1am, then a slight chance of rain and snow after 3am. Patchy frost. Otherwise, mostly cloudy, with a low around 34. South wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 34 °F

    Slight Chance
    Rain/Snow

  • Thursday

    Thursday: Patchy frost before 9am. Otherwise, mostly sunny, with a high near 54. South southeast wind around 6 mph becoming southwest in the afternoon.

    High: 54 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 38. South southeast wind around 6 mph.

    Low: 38 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 56. South southeast wind around 5 mph becoming light and variable in the morning.

    High: 56 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41. North northwest wind around 5 mph becoming light and variable in the evening.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain. Mostly cloudy, with a high near 65.

    High: 65 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A slight chance of rain before 11pm. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of rain and snow before 1am, then a slight chance of rain and snow after 3am. Patchy frost. Otherwise, mostly cloudy, with a low around 34. South wind 3 to 5 mph. Chance of precipitation is 20%.
Thursday
Patchy frost before 9am. Otherwise, mostly sunny, with a high near 54. South southeast wind around 6 mph becoming southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 38. South southeast wind around 6 mph.
Friday
Mostly sunny, with a high near 56. South southeast wind around 5 mph becoming light and variable in the morning.
Friday Night
Mostly cloudy, with a low around 41. North northwest wind around 5 mph becoming light and variable in the evening.
Saturday
Mostly cloudy, with a high near 64.
Saturday Night
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 47.
Sunday
A chance of rain. Mostly cloudy, with a high near 65.
Sunday Night
A slight chance of rain before 11pm. Mostly cloudy, with a low around 48.
Monday
A slight chance of rain. Partly sunny, with a high near 66.
Monday Night
A chance of rain. Mostly cloudy, with a low around 49.
Tuesday
A chance of rain. Partly sunny, with a high near 59.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 47.
Wednesday
A chance of rain. Mostly cloudy, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WA
 47.53°N 122.14°W (Elev. 873 ft)
Last Update:
11:26 pm PDT Apr 15, 2026
Forecast Valid:
12am PDT Apr 16, 2026-6pm PDT Apr 22, 2026
 
Forecast Discussion
 
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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