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.

Clear

51°F

11°C

Humidity 92%
Wind Speed SSE 3 MPH
Barometer 30.17 in (1021.67 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 19 Sep 05:53 AM PDT
Extended Forecast for

4 Miles SSE Newcastle WA

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 72. Calm wind.

    High: 72 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Increasing clouds, with a low around 52. Calm wind.

    Low: 52 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 73. Light north northwest wind.

    High: 73 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 52. Light north wind.

    Low: 52 °F

    Mostly Clear

  • Monday

    Monday: Partly sunny, with a high near 70. Calm wind.

    High: 70 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 67.

    High: 67 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 72. Calm wind.
Tonight
Increasing clouds, with a low around 52. Calm wind.
Sunday
Mostly sunny, with a high near 73. Light north northwest wind.
Sunday Night
Mostly clear, with a low around 52. Light north wind.
Monday
Partly sunny, with a high near 70. Calm wind.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly cloudy, with a high near 67.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
A slight chance of rain before 11pm. Mostly cloudy, with a low around 51.
Thursday
Mostly cloudy, with a high near 64.
Thursday Night
A slight chance of rain. Mostly cloudy, with a low around 49.
Friday
A slight chance of rain. Partly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Newcastle WA
 47.48°N 122.12°W (Elev. 499 ft)
Last Update:
12:25 am PDT Sep 19, 2026
Forecast Valid:
6am PDT Sep 19, 2026-6pm PDT Sep 25, 2026
 
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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