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

Hazardous Weather Conditions

Current conditions at

Grand Coulee Dam Airport (K3W7)

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

haze

81°F

27°C

Humidity 39%
Wind Speed WNW 3 MPH
Barometer 29.98 in (1015.24 mb)
Dewpoint 54°F (12°C)
Visibility 5.00 mi
Heat Index81°F (27°C)
Last update 19 Aug 12:10 PM PDT
Extended Forecast for

Hartline WA

  • This Afternoon

    This Afternoon: Widespread haze. Mostly sunny, with a high near 89. South wind around 8 mph.

    High: 89 °F

    Haze

  • Tonight

    Tonight: Widespread haze after 3am. Partly cloudy, with a low around 61. South wind 5 to 7 mph becoming east after midnight.

    Low: 61 °F

    Partly Cloudy
    then Haze

  • Thursday

    Thursday: Sunny, with a high near 93. Northeast wind 5 to 8 mph becoming southwest in the afternoon.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64. Southwest wind around 6 mph becoming north after midnight.

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny and hot, with a high near 96. Northeast wind 6 to 9 mph becoming southeast in the afternoon.

    High: 96 °F

    Hot

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 11pm. Cloudy, with a low around 68.

    Low: 68 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before 11am, then a slight chance of showers. Partly sunny, with a high near 91. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 57. Breezy.

    Low: 57 °F

    Slight Chance
    Showers and
    Breezy then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Widespread haze. Mostly sunny, with a high near 89. South wind around 8 mph.
Tonight
Widespread haze after 3am. Partly cloudy, with a low around 61. South wind 5 to 7 mph becoming east after midnight.
Thursday
Sunny, with a high near 93. Northeast wind 5 to 8 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 64. Southwest wind around 6 mph becoming north after midnight.
Friday
Partly sunny and hot, with a high near 96. Northeast wind 6 to 9 mph becoming southeast in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms after 11pm. Cloudy, with a low around 68.
Saturday
A chance of showers and thunderstorms before 11am, then a slight chance of showers. Partly sunny, with a high near 91. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 57. Breezy.
Sunday
Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hartline WA
 47.7°N 119.12°W (Elev. 1991 ft)
Last Update:
11:47 am PDT Aug 19, 2026
Forecast Valid:
12pm PDT Aug 19, 2026-6pm PDT Aug 25, 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