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Grinnell, Washington Weather Forecast
Grinnell, Washington Weather
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Weather Forecast for Grinnell, Washington : Whitman County
Issued: 1:26 am PST Dec 15, 2025 Latitude: 46.9621146 Longitude: -117.0687809 View on Google Maps

MouseOver for Detail Forecast
Overnight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
60% chance of rain on Overnight 100% chance of rain on Monday 60% chance of rain on Tuesday 80% chance of rain & snow on Wednesday 90% chance of rain & snow on Thursday 80% chance of rain & snow on Friday 60% chance of snow on Saturday 50% chance of rain & snow on Sunday
Low: 40°F High: 52°F High: 50°F High: 45°F High: 43°F High: 43°F High: 39°F High: 40°F
Low: 38°F Low: 35°F Low: 32°F Low: 36°F Low: 30°F Low: 30°F  
Rain Rain Rain Rain & Snow Rain & Snow Rain & Snow Snow Rain & Snow
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Current Conditions at
PULLMAN - (KPUW)
46°
Feels like 41°F
Cloudy
as of 1:53 AM PST
Rel. Humidity: 56%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 30.10 in.
Flight Rule: VFR
Wind Data
10 MPH
Gust: 16 MPH
100° East
Cloud Level(s): Broken at 9000ft, Solid Overcast at 11000ft
Current Conditions at
LEWISTON - (KLWS)
52°
Mostly Cloudy
as of 1:56 AM PST
Rel. Humidity: 46%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 30.09 in.
Flight Rule: VFR
Wind Data
3 MPH
060° Northeast
Cloud Level(s): Few at 9000ft, Broken at 11000ft
Current Conditions at
SPOKANE - (KGEG)
48°
Feels like 42°F
Cloudy
as of 1:53 AM PST
Rel. Humidity: 57%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
13 MPH
160° South
Cloud Level(s): Broken at 10000ft, Solid Overcast at 12000ft
Current Conditions at
SPOKANE/FELTS - (KSFF)
46°
Mostly Cloudy
as of 1:53 AM PST
Rel. Humidity: 70%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 10000ft, Broken at 12000ft
60% chance of rain Overnight Overnight... Rain likely, mainly after 4am. Mostly cloudy, with a low around 40. Southeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
100% chance of rain Monday Monday... Rain, mainly before 4pm. High near 52. South wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
30% chance of rain Monday Night Monday Night... A chance of rain before 10pm, then a chance of rain after 4am. Mostly cloudy, with a low around 38. Breezy, with a southwest wind 17 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
60% chance of rain Tuesday Tuesday... Rain likely, mainly after 10am. Mostly cloudy, with a high near 50. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
100% chance of rain Tuesday Night Tuesday Night... Rain. Low around 35. Windy, with a south wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
80% chance of rain & snow Wednesday Wednesday... Rain and snow before 10am, then a chance of snow between 10am and 4pm. High near 45. Windy. Chance of precipitation is 80%. Little or no snow accumulation expected.
30% chance of snow Wednesday Night Wednesday Night... A 30 percent chance of snow, mainly after 4am. Mostly cloudy, with a low around 32. New snow accumulation of less than a half inch possible.
90% chance of rain & snow Thursday Thursday... A chance of snow before 10am, then rain, possibly mixed with snow. High near 43. Chance of precipitation is 90%.
90% chance of rain & snow Thursday Night Thursday Night... Rain, possibly mixed with snow before 7pm, then rain between 7pm and 1am, then rain, possibly mixed with snow after 1am. Low around 36. Chance of precipitation is 90%.
80% chance of rain & snow Friday Friday... Rain and snow, mainly before 4pm. High near 43. Chance of precipitation is 80%.
50% chance of rain & snow Friday Night Friday Night... A chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 50%.
60% chance of snow Saturday Saturday... Snow likely. Partly sunny, with a high near 39. Chance of precipitation is 60%.
50% chance of snow Saturday Night Saturday Night... A 50 percent chance of snow. Mostly cloudy, with a low around 30.
50% chance of rain & snow Sunday Sunday... A chance of rain and snow. Mostly cloudy, with a high near 40. Chance of precipitation is 50%.
Current Radar Image


Sun Almanac for Grinnell, Washington
Sunrise: 07:28 AM
Sunset: 4:00 PM
Civil Sunrise:06:52 AM
Civil Sunset: 4:35 PM
Nautical Sunrise: 06:13 AM
Nautical Sunset: 5:14 PM
Astro Sunrise: 05:36 AM
Astro Sunset: 5:51 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.