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.

Rain

37°F

3°C

Humidity 93%
Wind Speed SSE 6 MPH
Barometer 30.04 in (1017.27 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 15 Apr 11:00 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: A 20 percent chance of showers before midnight. Patchy frost after midnight. Otherwise, mostly cloudy, with a low around 35. South wind 3 to 5 mph.

    Low: 35 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Patchy frost before 9am. Otherwise, mostly sunny, with a high near 54. Southwest wind around 6 mph.

    High: 54 °F

    Patchy Frost
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 39. South wind around 6 mph.

    Low: 39 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 56. South 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 63.

    High: 63 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Sunday

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

    High: 65 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers before midnight. Patchy frost after midnight. Otherwise, mostly cloudy, with a low around 35. South wind 3 to 5 mph.
Thursday
Patchy frost before 9am. Otherwise, mostly sunny, with a high near 54. Southwest wind around 6 mph.
Thursday Night
Mostly cloudy, with a low around 39. South wind around 6 mph.
Friday
Mostly sunny, with a high near 56. South 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 63.
Saturday Night
Mostly cloudy, with a low around 46.
Sunday
A slight chance of rain. Mostly cloudy, with a high near 65.
Sunday Night
Mostly cloudy, with a low around 47.
Monday
Partly sunny, with a high near 67.
Monday Night
Partly cloudy, with a low around 49.
Tuesday
A slight chance of rain. Partly sunny, with a high near 63.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 48.
Wednesday
A chance of rain. Mostly cloudy, with a high near 57.
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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:
2:10 pm PDT Apr 15, 2026
Forecast Valid:
11pm PDT Apr 15, 2026-6pm PDT Apr 22, 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