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Grand Coulee, Washington Weather Forecast
Grand Coulee, Washington Weather
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Weather Forecast for Grand Coulee, Washington : Grant County
Issued: 1:26 am PST Dec 15, 2025 Latitude: 47.9415408 Longitude: -119.0033548 View on Google Maps

MouseOver for Detail Forecast
Overnight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
80% chance of rain on Overnight 80% chance of rain on Monday 60% chance of rain on Tuesday 30% chance of rain & snow on Wednesday 80% chance of rain & snow on Thursday 20% chance of rain & snow on Friday 30% chance of snow on Saturday 20% chance of rain & snow on Sunday
Low: 42°F High: 58°F High: 52°F High: 49°F High: 43°F High: 45°F High: 43°F High: 41°F
Low: 39°F Low: 41°F Low: 37°F Low: 35°F Low: 31°F Low: 31°F  
Rain Rain Rain Rain & Snow Rain & Snow Rain & Snow Snow Rain & Snow
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Current Conditions at
OMAK - (KOMK)
39°
Mostly Cloudy
as of 1:53 AM PST
Rel. Humidity: 100%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 7000ft, Broken at 8500ft
Current Conditions at
EPHRATA - (KEPH)
41°
Mostly Clear
as of 1:53 AM PST
Rel. Humidity: 93%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
7 MPH
010° North
Cloud Level(s): Few at 10000ft
Current Conditions at
MOSES LAKE - (KMWH)
41°
Mostly Clear
as of 1:52 AM PST
Rel. Humidity: 93%
Dew Point: 39°F
Visibility: 9 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
6 MPH
030° Northeast
Cloud Level(s): Few at 9000ft, Few at 12000ft
80% chance of rain Overnight Overnight... Rain, mainly after 4am. Low around 42. East wind around 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
80% chance of rain Monday Monday... Rain, mainly before 10am. High near 58. Breezy, with a south wind 16 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 39. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 31 mph.
60% chance of rain Tuesday Tuesday... Rain likely, mainly after 4pm. Partly sunny, with a high near 52. Southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
90% chance of rain Tuesday Night Tuesday Night... Rain, mainly before 4am. Low around 41. Windy, with a southwest wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
30% chance of rain & snow Wednesday Wednesday... A chance of rain and snow before 10am. Mostly sunny, with a high near 49. Windy. Chance of precipitation is 30%. Little or no snow accumulation expected.
60% chance of rain & snow Wednesday Night Wednesday Night... Rain and snow likely after 4am. Mostly cloudy, with a low around 37. Chance of precipitation is 60%. Little or no snow accumulation expected.
80% chance of rain & snow Thursday Thursday... Rain, possibly mixed with snow, becoming all rain after 1pm. High near 43. Chance of precipitation is 80%.
60% chance of rain & snow Thursday Night Thursday Night... Rain likely before 10pm, then a chance of rain and snow. Mostly cloudy, with a low around 35. Chance of precipitation is 60%.
20% chance of rain & snow Friday Friday... A slight chance of rain and snow. Mostly sunny, with a high near 45. Chance of precipitation is 20%.
20% chance of snow Friday Night Friday Night... A 20 percent chance of snow. Partly cloudy, with a low around 31.
30% chance of snow Saturday Saturday... A 30 percent chance of snow. Mostly sunny, with a high near 43.
30% chance of snow Saturday Night Saturday Night... A 30 percent chance of snow. Mostly cloudy, with a low around 31.
20% chance of rain & snow Sunday Sunday... A slight chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 20%.
Sun Almanac for Grand Coulee, Washington
Sunrise: 07:39 AM
Sunset: 4:03 PM
Civil Sunrise:07:03 AM
Civil Sunset: 4:40 PM
Nautical Sunrise: 06:23 AM
Nautical Sunset: 5:19 PM
Astro Sunrise: 05:46 AM
Astro Sunset: 5:57 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.