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Grannis, Montana Weather Forecast
Grannis, Montana Weather
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Weather Forecast for Grannis, Montana : Park County
Issued: 2:13 am MST Dec 17, 2025 Latitude: 45.7566021 Longitude: -110.4963148 View on Google Maps

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Overnight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
20% chance of rain on Overnight 90% chance of rain & snow on Wednesday 30% chance of snow on Thursday 80% chance of rain & snow on Friday 20% chance of snow on Saturday 20% chance of snow on Sunday 40% chance of rain & snow on Monday 20% chance of rain & snow on Tuesday
Low: 49°F High: 49 °F High: 42°F High: 51°F High: 38°F High: 43°F High: 50°F High: 45°F
Low: 23°F Low: 36 °F Low: 24°F Low: 20°F Low: 30°F Low: 28°F  
Rain Rain & Snow Snow Rain & Snow Snow Snow Rain & Snow Rain & Snow
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Current Conditions at
LIVINGSTON - (KLVM)
48°
Feels like 39°F
Clear
as of 1:53 AM MST
Rel. Humidity: 39%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.62 in.
Flight Rule: VFR
Wind Data
30 MPH
Gust: 45 MPH
220° Southwest
Cloud Level(s): Clear
Current Conditions at
BOZEMAN - (KBZN)
39°
Cloudy
as of 1:56 AM MST
Rel. Humidity: 55%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.68 in.
Flight Rule: VFR
Wind Data
7 MPH
110° East
Cloud Level(s): Solid Overcast at 9500ft
Current Conditions at
YELLOWSTONE - (KP60)
36°
Feels like 27°F
Partly Cloudy
as of 1:56 AM MST
Rel. Humidity: 74%
Dew Point: 28°F
Pressure: 29.88 in.
Wind Data
12 MPH
Gust: 30 MPH
270° West
Current Conditions at
HELENA - (KHLN)
48°
Clear
as of 1:53 AM MST
Rel. Humidity: 34%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 29.56 in.
Flight Rule: VFR
Wind Data
8 MPH
160° South
Cloud Level(s): Clear
20% chance of rain Overnight Overnight... A 20 percent chance of showers after 4am. Mostly cloudy, with a steady temperature around 49. South southwest wind 40 to 43 mph, with gusts as high as 60 mph.

90% chance of rain & snow Wednesday Wednesday... Rain showers before 11am, then a chance of snow showers between 11am and 1pm. Temperature rising to near 49 by 10am, then falling to around 32 during the remainder of the day. West wind 41 to 47 mph, with gusts as high as 65 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 23. West wind 35 to 40 mph decreasing to 21 to 26 mph after midnight. Winds could gust as high as 60 mph.

30% chance of snow Thursday Thursday... A 30 percent chance of snow after 11am. Mostly cloudy, with a high near 42. Southwest wind 13 to 18 mph. Little or no snow accumulation expected.

50% chance of rain & snow Thursday Night Thursday Night... A chance of snow before 8pm, then a chance of rain and snow between 8pm and 11pm, then a chance of rain after 11pm. Mostly cloudy, with a temperature falling to near 36 by 10pm, then rising to around 43 during the remainder of the night. Southwest wind 31 to 37 mph, with gusts as high as 50 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

80% chance of rain & snow Friday Friday... Rain before 2pm, then rain, possibly mixed with snow. High near 51. Southwest wind 33 to 38 mph decreasing to 23 to 28 mph in the afternoon. Winds could gust as high as 55 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

80% chance of rain & snow Friday Night Friday Night... Rain, possibly mixed with snow, becoming all snow after 8pm. Low around 24. West wind 13 to 17 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

20% chance of snow Saturday Saturday... A 20 percent chance of snow before 11am. Mostly sunny, with a high near 38. West southwest wind 11 to 16 mph.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 20. Southwest wind 10 to 13 mph.

20% chance of snow Sunday Sunday... A slight chance of snow after 11am, mixing with rain after 2pm. Partly sunny, with a high near 43. Southwest wind 8 to 10 mph. Chance of precipitation is 20%.

30% chance of rain & snow Sunday Night Sunday Night... A chance of rain and snow. Mostly cloudy, with a low around 30. Southwest wind 9 to 13 mph. Chance of precipitation is 30%.

40% chance of rain & snow Monday Monday... A chance of rain and snow. Mostly cloudy, with a high near 50. West southwest wind 14 to 17 mph. Chance of precipitation is 40%.

30% chance of rain & snow Monday Night Monday Night... A chance of rain and snow. Mostly cloudy, with a low around 28. West southwest wind 10 to 13 mph. Chance of precipitation is 30%.

20% chance of rain & snow Tuesday Tuesday... A slight chance of rain and snow. Partly sunny, with a high near 45. Southwest wind 9 to 11 mph. Chance of precipitation is 20%.

Current Radar Image


Sun Almanac for Grannis, Montana
Sunrise: 07:58 AM
Sunset: 4:39 PM
Civil Sunrise:07:24 AM
Civil Sunset: 5:13 PM
Nautical Sunrise: 06:46 AM
Nautical Sunset: 5:51 PM
Astro Sunrise: 06:09 AM
Astro Sunset: 6:27 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.