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.

Partly Cloudy

53°F

12°C

Humidity 96%
Wind Speed N 0 MPH
Barometer 30.11 in (1019.64 mb)
Dewpoint 52°F (11°C)
Visibility 8.00 mi
Last update 20 Sep 07:53 AM PDT
Extended Forecast for

3 Miles SE Newcastle WA

  • Today

    Today: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72. Calm wind.

    High: 72 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 51. Calm wind.

    Low: 51 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 70. Calm wind.

    High: 70 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Monday Night

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

    Low: 52 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 67. Calm wind.

    High: 67 °F

    Mostly Cloudy

  • Tuesday Night

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

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72. Calm wind.
Tonight
Patchy fog after 4am. Otherwise, increasing clouds, with a low around 51. Calm wind.
Monday
Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 70. Calm wind.
Monday Night
Increasing clouds, with a low around 52. Calm wind.
Tuesday
Mostly cloudy, with a high near 67. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 49.
Thursday
Mostly cloudy, with a high near 62.
Thursday Night
A chance of rain, mainly after 11pm. Mostly cloudy, with a low around 49.
Friday
A chance of rain. Mostly cloudy, with a high near 60.
Friday Night
A chance of rain. Mostly cloudy, with a low around 47.
Saturday
Partly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Newcastle WA
 47.51°N 122.1°W (Elev. 1201 ft)
Last Update:
12:25 am PDT Sep 20, 2026
Forecast Valid:
8am PDT Sep 20, 2026-6pm PDT Sep 26, 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