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Keystone, Montana Weather Forecast
Keystone, Montana Weather
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Weather Forecast for Keystone, Montana : Mineral County
Issued: 1:01 am MST Dec 17, 2025 Latitude: 47.2682629 Longitude: -114.9356888 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
50% chance of snow on Today 30% chance of snow on Tonight 50% chance of snow on Thursday 50% chance of snow on Friday 50% chance of snow on Saturday 20% chance of snow on Sunday 20% chance of snow on Monday 20% chance of snow on Tuesday
High: 30 °F Low: 29°F High: 39°F High: 37°F High: 32°F High: 34°F High: 36°F High: 34°F
Low: 32°F Low: 26°F Low: 25°F Low: 28°F Low: 24°F  
Snow Snow Snow Snow Snow Snow Snow Snow
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Current Conditions at
MULLAN PASS - (KMLP)
34°
Feels like 23°F
Cloudy
Heavy Rain Mist
as of 5:46 AM PST
Rel. Humidity: 100%
Dew Point: 34°F
Visibility: 2 1/2 Miles
Pressure: 29.19 in.
Flight Rule: IFR
Wind Data
15 MPH
Gust: 30 MPH
230° Southwest
Cloud Level(s): Few at 500ft, Solid Overcast at 1100ft
Current Conditions at
MISSOULA - (KMSO)
45°
Feels like 37°F
Cloudy
Heavy Rain Mist
as of 7:02 AM MST
Rel. Humidity: 93%
Dew Point: 43°F
Visibility: 2 1/2 Miles
Pressure: 29.28 in.
Flight Rule: IFR
Wind Data
16 MPH
Gust: 29 MPH
310° Northwest
Cloud Level(s): Few at 2200ft, Broken at 3400ft, Solid Overcast at 4100ft
50% chance of snow Today Today... A 50 percent chance of snow. Mostly cloudy, with a temperature falling to around 30 by 5pm. Breezy, with a west wind 14 to 19 mph increasing to 20 to 25 mph in the morning. Winds could gust as high as 60 mph. Total daytime snow accumulation of less than a half inch possible.
30% chance of snow Tonight Tonight... A 30 percent chance of snow. Mostly cloudy, with a low around 29. West wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 25 mph. Little or no snow accumulation expected.
50% chance of snow Thursday Thursday... A 50 percent chance of snow. Cloudy, with a high near 39. Calm wind becoming south around 5 mph in the afternoon. New snow accumulation of less than one inch possible.
50% chance of snow Thursday Night Thursday Night... A 50 percent chance of snow. Snow level 4200 feet rising to 5100 feet. Cloudy, with a low around 32. South southwest wind 6 to 9 mph, with gusts as high as 26 mph. New snow accumulation of less than a half inch possible.
50% chance of snow Friday Friday... A 50 percent chance of snow. Mostly cloudy, with a high near 37. West wind 6 to 8 mph, with gusts as high as 23 mph. New snow accumulation of around an inch possible.
50% chance of snow Friday Night Friday Night... A 50 percent chance of snow. Mostly cloudy, with a low around 26. New snow accumulation of less than one inch possible.
50% chance of snow Saturday Saturday... A 50 percent chance of snow. Mostly cloudy, with a high near 32. New snow accumulation of less than a half inch possible.
20% chance of snow Saturday Night Saturday Night... A chance of snow. Mostly cloudy, with a low around 25.
20% chance of snow Sunday Sunday... A chance of snow. Mostly cloudy, with a high near 34.
20% chance of snow Sunday Night Sunday Night... A chance of snow. Snow level rising to 4300 feet after midnight. Mostly cloudy, with a low around 28.
20% chance of snow Monday Monday... A chance of snow. Snow level 4800 feet lowering to 4000 feet. Mostly cloudy, with a high near 36.
20% chance of snow Monday Night Monday Night... A chance of snow. Mostly cloudy, with a low around 24.
20% chance of snow Tuesday Tuesday... A chance of snow. Partly sunny, with a high near 34.
Sun Almanac for Keystone, Montana
Sunrise: 08:22 AM
Sunset: 4:51 PM
Civil Sunrise:07:46 AM
Civil Sunset: 5:26 PM
Nautical Sunrise: 07:07 AM
Nautical Sunset: 6:05 PM
Astro Sunrise: 06:30 AM
Astro Sunset: 6:43 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.