Weather in Grand Coulee, WA
Updated 2026-09-26 08:15 local time · ZIP codes 99133
Sunny
No government weather alerts were returned for this location at the latest update.
Next hours
42°5% rain45°3% rain47°2% rain50°1% rain52°1% rain54°1% rain56°1% rain57°0% rain57°0% rain57°1% rain
55°9% rain
56°10% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 10%).
It feels like 37°F with winds near 2 mph.
57°F, 0% rain chance and 6 mph wind.
Visibility is around 6 mi; gusts may reach 17 mph.
Current temperature is 42°F, wind 2 mph, rain chance up to 10%.
UV index is 0.
Local weather characteristics in Grand Coulee
Washington has a mild, wetter marine climate west of the Cascades and a much drier interior climate east of the mountains. Terrain creates strong local rain, snow and temperature differences.
Grand Coulee is part of the West weather region. The forecast point is near 47.94°N latitude and 119.00°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Grand Coulee weather today
Sunny and 42°F in Grand Coulee, WA. Today's high is 57°F with a 3% rain chance. Winds are around 2 mph with gusts near 3 mph. Relative humidity is 66%, pressure is 30.09 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Grand Coulee
Sunrise is at 06:48 AM and sunset is at 06:46 PM. Tomorrow's forecast calls for Sunny with a high near 59°F and a low near 45°F. The maximum rain chance is 4%.