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

Grand Coulee Dam Airport (K3W7)

Lat: 47.92205°NLon: 119.083°WElev: 1593.0ft.

light rain,haze

75°F

24°C

Humidity 41%
Wind Speed NW 4 MPH
Barometer 30.09 in (1018.96 mb)
Dewpoint 50°F (10°C)
Visibility 4.00 mi
Last update 18 Sep 01:55 PM PDT
Extended Forecast for

Coulee City WA

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. Light southwest wind.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 54. Light and variable wind becoming north around 5 mph after midnight.

    Low: 54 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. Light and variable wind becoming south 5 to 7 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. South wind 5 to 7 mph becoming light and variable in the evening.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 80. Northeast wind around 6 mph becoming light and variable.

    High: 80 °F

    Sunny

  • Sunday Night

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

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 78. Light southwest wind.
Tonight
Mostly clear, with a low around 54. Light and variable wind becoming north around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 78. Light and variable wind becoming south 5 to 7 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 54. South wind 5 to 7 mph becoming light and variable in the evening.
Sunday
Sunny, with a high near 80. Northeast wind around 6 mph becoming light and variable.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Coulee City WA
 47.63°N 119.29°W (Elev. 1568 ft)
Last Update:
11:46 am PDT Sep 18, 2026
Forecast Valid:
2pm PDT Sep 18, 2026-6pm PDT Sep 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