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

Severe Thunderstorms in the Central Plains and Lower Missouri Valley; Heat Continues in the Southeast and Southwest

Severe thunderstorms capable of large hail and damaging wind gusts are forecast to impact the central Plains into the Lower Missouri Valley through this afternoon. Dangerous heat persists across the southern Plains, Southeast U.S. and Puerto Rico this week, and will return to the Southwest today. Read More >

Current conditions at

Seattle, Seattle-Tacoma International Airport (KSEA)

Lat: 47.44472°NLon: 122.31361°WElev: 427.0ft.

Partly Cloudy

68°F

20°C

Humidity 63%
Wind Speed SSW 9 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Aug 12:53 PM PDT
Extended Forecast for

Seatac WA

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. Southwest wind around 6 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 57. South southwest wind 5 to 7 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 77. South wind around 5 mph becoming northwest in the afternoon.

    High: 77 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 81. Calm wind becoming north northwest 5 to 7 mph in the afternoon.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Friday Night

    Friday Night: A slight chance of rain after 11pm. Partly cloudy, with a low around 57.

    Low: 57 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A chance of rain before 11am. Mostly cloudy, with a high near 71.

    High: 71 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 78. Southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 57. South southwest wind 5 to 7 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 77. South wind around 5 mph becoming northwest in the afternoon.
Wednesday Night
Partly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 81. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Partly sunny, with a high near 78.
Friday Night
A slight chance of rain after 11pm. Partly cloudy, with a low around 57.
Saturday
A chance of rain before 11am. Mostly cloudy, with a high near 71.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 73.
Sunday Night
Mostly clear, with a low around 56.
Monday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Seatac WA
 47.44°N 122.3°W (Elev. 358 ft)
Last Update:
11:26 am PDT Aug 18, 2026
Forecast Valid:
1pm PDT Aug 18, 2026-6pm PDT Aug 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