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

Extreme Heat and Excessive Rainfall This Week

A significant heat wave is underway for the Intermountain West, Northern Plains, and Upper Great Lakes, peaking in intensity through midweek and lingering across parts of the Northern Plains and Midwest until this weekend. In southwest Texas, excessive rainfall may bring a risk for potentially life-threatening flash and arroyo flooding through Thursday. Read More >

Current conditions at

Renton Municipal Airport (KRNT)

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

Clear

84°F

29°C

Humidity 26%
Wind Speed NNW 8 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 14 Jul 05:35 PM PDT
Extended Forecast for

Newcastle WA

  • Tonight

    Tonight: Mostly clear, with a low around 58. North northwest wind around 6 mph becoming light and variable after midnight.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Northeast wind around 5 mph becoming light and variable.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain before 3am, then a chance of rain after 4am. Increasing clouds, with a low around 59. North wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 40%.

    Low: 59 °F

    Mostly Clear
    then Chance
    Rain

  • Thursday

    Thursday: Rain. High near 72. Southwest wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 72 °F

    Rain

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 56. Southwest wind around 7 mph.

    Low: 56 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 58. North northwest wind around 6 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 84. Northeast wind around 5 mph becoming light and variable.
Wednesday Night
A slight chance of rain before 3am, then a chance of rain after 4am. Increasing clouds, with a low around 59. North wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 40%.
Thursday
Rain. High near 72. Southwest wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 56. Southwest wind around 7 mph.
Friday
Mostly sunny, with a high near 77.
Friday Night
Mostly clear, with a low around 55.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 59.
Monday
Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 87.
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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:
3:34 pm PDT Jul 14, 2026
Forecast Valid:
5pm PDT Jul 14, 2026-6pm PDT Jul 21, 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