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Mammoth, Montana Weather Forecast
Mammoth, Montana Weather
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Weather Forecast for Mammoth, Montana : Madison County
Issued: 2:47 am MST Dec 17, 2025 Latitude: 45.6696484 Longitude: -112.0166544 View on Google Maps

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Overnight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
30% chance of rain & snow on Overnight 90% chance of rain & snow on Wednesday 50% chance of snow on Thursday 70% chance of snow on Friday 10% chance of snow on Saturday 10% chance of snow on Sunday 20% chance of snow on Monday 10% chance of snow on Tuesday
Low: 39°F High: 20 °F High: 35°F High: 40°F High: 28°F High: 32°F High: 38°F High: 36°F
Low: 19°F Low: 30°F Low: 21°F Low: 20°F Low: 28°F Low: 27°F  
Rain & Snow Rain & Snow Snow Snow Snow Snow Snow Snow
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Current Conditions at
BUTTE - (KBTM)
43°
Cloudy
as of 2:53 AM MST
Rel. Humidity: 48%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.62 in.
Flight Rule: VFR
Wind Data
5 MPH
080° East
Cloud Level(s): Solid Overcast at 5000ft
Current Conditions at
DILLON - (KDLN)
46°
Feels like 38°F
Partly Cloudy
as of 2:53 AM MST
Rel. Humidity: 39%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 29.63 in.
Flight Rule: VFR
Wind Data
22 MPH
Gust: 36 MPH
200° South
Cloud Level(s): Scattered at 11000ft
Current Conditions at
BOZEMAN - (KBZN)
46°
Mostly Cloudy
as of 2:56 AM MST
Rel. Humidity: 36%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 29.62 in.
Flight Rule: VFR
Wind Data
5 MPH
Cloud Level(s): Scattered at 8500ft, Broken at 11000ft
Current Conditions at
HELENA - (KHLN)
54°
Partly Cloudy
as of 2:53 AM MST
Rel. Humidity: 32%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.50 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 22 MPH
240° Southwest
Cloud Level(s): Scattered at 10000ft
30% chance of rain & snow Overnight Overnight... A chance of rain and snow, mainly after 5am. Mostly cloudy, with a steady temperature around 39. Breezy, with a southwest wind around 26 mph, with gusts as high as 50 mph. Chance of precipitation is 30%. Total nighttime snow accumulation of less than a half inch possible.

90% chance of rain & snow Wednesday Wednesday... Rain and snow before 11am, then a slight chance of snow between 11am and noon. Temperature falling to around 20 by 5pm. Windy, with a west wind 30 to 34 mph, with gusts as high as 70 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 19. Windy, with a west southwest wind 27 to 32 mph decreasing to 15 to 20 mph after midnight. Winds could gust as high as 65 mph.

50% chance of snow Thursday Thursday... A 50 percent chance of snow after 11am. Mostly cloudy, with a high near 35. South southwest wind 13 to 17 mph, with gusts as high as 32 mph. New snow accumulation of less than a half inch possible.

70% chance of snow Thursday Night Thursday Night... Snow likely, mainly before 11pm. Mostly cloudy, with a low around 30. Breezy, with a southwest wind 18 to 26 mph, with gusts as high as 55 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

70% chance of snow Friday Friday... Snow likely. Mostly cloudy, with a high near 40. Breezy, with a southwest wind 20 to 26 mph, with gusts as high as 55 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

70% chance of snow Friday Night Friday Night... Snow likely, mainly before 11pm. Mostly cloudy, with a low around 21. West wind around 17 mph, with gusts as high as 37 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

10% chance of snow Saturday Saturday... A slight chance of snow. Mostly sunny, with a high near 28. West southwest wind around 15 mph, with gusts as high as 31 mph.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 20.

10% chance of snow Sunday Sunday... A slight chance of snow after 11am. Mostly sunny, with a high near 32.

20% chance of snow Sunday Night Sunday Night... A chance of snow. Mostly cloudy, with a low around 28.

20% chance of snow Monday Monday... A chance of snow. Partly sunny, with a high near 38.

10% chance of snow Monday Night Monday Night... A slight chance of snow. Mostly cloudy, with a low around 27.

10% chance of snow Tuesday Tuesday... A slight chance of snow. Partly sunny, with a high near 36.

Current Radar Image


Sun Almanac for Mammoth, Montana
Sunrise: 08:04 AM
Sunset: 4:45 PM
Civil Sunrise:07:29 AM
Civil Sunset: 5:19 PM
Nautical Sunrise: 06:52 AM
Nautical Sunset: 5:57 PM
Astro Sunrise: 06:15 AM
Astro Sunset: 6:33 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.