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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

SEATTLE WEATHER FORECAST OFFICE (SEAW1)

Lat: 47.68528°NLon: 122.25111°WElev: 29.0ft.

NA

63°F

17°C

Humidity 79%
Wind Speed NE 3 MPH
Barometer 29.94 in (1013.89 mb)
Dewpoint 56°F (13°C)
Visibility NA
Last update 28 Aug 07:30 AM PDT
Extended Forecast for

Sammamish WA

  • Today

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

    High: 72 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Rain, mainly after 2am. Low around 52. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Chance Rain
    then Rain

  • Saturday

    Saturday: Rain, mainly before 9am, then a chance of showers and thunderstorms after 11am. High near 68. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Chance Rain
    then Mostly
    Cloudy

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69. Light south wind.

    High: 69 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

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

    Low: 50 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Monday Night

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

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain after 11am. Partly sunny, with a high near 70.

    High: 70 °F

    Slight Chance
    Rain

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 72. Calm wind.
Tonight
Rain, mainly after 2am. Low around 52. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Rain, mainly before 9am, then a chance of showers and thunderstorms after 11am. High near 68. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 51. Calm wind.
Sunday
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69. Light south wind.
Sunday Night
Mostly cloudy, with a low around 50.
Monday
Partly sunny, with a high near 72.
Monday Night
Mostly cloudy, with a low around 52.
Tuesday
A slight chance of rain after 11am. Partly sunny, with a high near 70.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 53.
Wednesday
Rain likely. Mostly cloudy, with a high near 64.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 51.
Thursday
A chance of rain. Mostly cloudy, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sammamish WA
 47.62°N 122.04°W (Elev. 469 ft)
Last Update:
11:26 pm PDT Aug 27, 2026
Forecast Valid:
7am PDT Aug 28, 2026-6pm PDT Sep 3, 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