National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

Lat: 47.49509°NLon: 122.21437°WElev: 23.0ft.

Overcast

63°F

17°C

Humidity 72%
Wind Speed S 8 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 18 Sep 11:20 AM PDT
Extended Forecast for

3 Miles E Newcastle WA

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 69. Light south southwest wind.

    High: 69 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 50. Calm wind becoming south around 5 mph.

    Low: 50 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 69. Calm wind.

    High: 69 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 69. Calm wind.

    High: 69 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 69. Light south southwest wind.
Tonight
Increasing clouds, with a low around 50. Calm wind becoming south around 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 69. Calm wind.
Saturday Night
Partly cloudy, with a low around 51. Calm wind.
Sunday
Mostly sunny, with a high near 69. Calm wind.
Sunday Night
Mostly clear, with a low around 50.
Monday
Mostly sunny, with a high near 67.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Partly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Partly sunny, with a high near 63.
Wednesday Night
Mostly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Newcastle WA
 47.53°N 122.11°W (Elev. 1237 ft)
Last Update:
11:26 am PDT Sep 18, 2026
Forecast Valid:
11am PDT Sep 18, 2026-6pm PDT Sep 24, 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