Live Weather & Forecast
Weather in Grand Coulee
Washington, United States · Real-time conditions & 3-day outlook
18°C
Feels like 18°C
64°F / Feels 64°F
Partly Cloudy
Grand Coulee, Washington
🌞 Daytime
Updated: 2026-04-13 12:45
Humidity
40%
Wind
5.4 km/h SSE
Wind Gust
6.2 km/h
Pressure
1009 mb
Visibility
16 km
UV Index
4.4
(Moderate)
Precipitation
0 mm
Cloud Cover
0%
Dew Point
3°C
Wind Degree
167°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
159.9 μg/m³
NO₂
2.8 μg/m³
O₃
84 μg/m³
SO₂
1 μg/m³
PM 2.5
1.1 μg/m³
PM 10
1.2 μg/m³
Weather Alerts 1
Met
· Moderate · Expected
Winter Weather Advisory issued April 13 at 11:07AM PDT until April 15 at 5:00PM PDT by NWS Spokane WA
* WHAT...Snow expected. Total snow accumulations up to 7 inches. Winds gusting as high as 35 mph. * WHERE...Chesaw Road, Boulder Creek Road, Highway 20 Wauconda Summit, and Sherman Pass. * WHEN...From 11 AM Tuesday to 5 PM PDT Wednesday. * IMPACTS...Travel could be difficult. Plan for winter driving conditions.
Slow down and use caution while traveling. For the latest travel information in Washington, go to https://wsdot.wa.gov/travel
Today's Hourly Forecast
24-hour breakdown for Grand Coulee, Washington
12 AM
12°
Clear
1 AM
11°
Clear
2 AM
10°
Clear
3 AM
10°
Clear
4 AM
9°
Patchy rain nearby
5 AM
10°
Clear
6 AM
10°
Clear
7 AM
11°
Sunny
8 AM
12°
Patchy rain nearby
9 AM
14°
Sunny
10 AM
15°
Sunny
11 AM
16°
Sunny
12 PM
18°
Partly Cloudy
1 PM
18°
Cloudy
2 PM
18°
Cloudy
3 PM
18°
Partly Cloudy
4 PM
18°
Partly Cloudy
5 PM
17°
Cloudy
6 PM
17°
Cloudy
7 PM
15°
Sunny
8 PM
13°
Clear
9 PM
12°
Clear
10 PM
9°
Clear
11 PM
7°
Clear
3-Day Forecast
Daily overview for Grand Coulee, Washington
Today
Sunny
18°
/
7°
🌧️ 0% chance of rain
💧 Avg. humidity: 56%
💨 Max wind: 14 km/h
🌧️ Total precip: 0.07 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:10 AM
🌇 Sunset: 07:44 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Moderate rain
11°
/
-0°
🌧️ 85% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 29.5 km/h
🌧️ Total precip: 13.04 mm
☀️ UV Index: 0.9
🌅 Sunrise: 06:08 AM
🌇 Sunset: 07:45 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Overcast
10°
/
-1°
🌧️ 0% chance of rain
💧 Avg. humidity: 66%
💨 Max wind: 31.7 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 0.9
🌅 Sunrise: 06:06 AM
🌇 Sunset: 07:47 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Best Time to Visit Grand Coulee
Plan your trip to Grand Coulee, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Grand Coulee?
Current conditions in Grand Coulee: Partly Cloudy, temperature 18°C, humidity 40%.
What is the best time to visit Grand Coulee?
The best time to visit Grand Coulee is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Grand Coulee?
Grand Coulee is located at approximately 47.9° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Grand Coulee?
The wettest period in Grand Coulee is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Grand Coulee?
For visits to Grand Coulee during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Grand Coulee in?
Grand Coulee is located in United States, in the state of Washington.
What are the public holidays in Grand Coulee in 2026?
View the 2026 public holidays for Grand Coulee on our Holidays page.
What are the GPS coordinates used for the weather forecast in Grand Coulee?
The weather forecast for Grand Coulee uses coordinates 47.9415, -119.0034.