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Big Arm, Montana Weather Forecast
Big Arm, Montana Weather
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Weather Forecast for Big Arm, Montana : Lake County
Issued: 1:01 am MST Dec 17, 2025 Latitude: 47.7979969 Longitude: -114.2948454 View on Google Maps

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Overnight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
50% chance of snow on Overnight 50% chance of snow on Wednesday 50% chance of snow on Thursday 50% chance of snow on Friday 20% chance of snow on Saturday 20% chance of snow on Sunday 20% chance of snow on Monday 20% chance of snow on Tuesday
Low: 39°F High: 47 °F High: 43°F High: 44°F High: 38°F High: 39°F High: 42°F High: 37°F
Low: 33°F Low: 36°F Low: 30°F Low: 30°F Low: 31°F Low: 29°F  
Snow Snow Snow Snow Snow Snow Snow Snow
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Current Conditions at
MISSOULA - (KMSO)
48°
Cloudy
Light Rain
as of 1:53 AM MST
Rel. Humidity: 61%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.52 in.
Flight Rule: VFR
Wind Data
6 MPH
260° West
Cloud Level(s): Broken at 5500ft, Solid Overcast at 7000ft
Current Conditions at
MULLAN PASS - (KMLP)
32°
Feels like 24°F
Clear
Light Snow Mist
as of 12:53 AM PST
Rel. Humidity: 92%
Dew Point: 30°F
Visibility: 3/4 Miles
Pressure: 29.42 in.
Flight Rule: MVFR
Wind Data
9 MPH
Gust: 25 MPH
190° South
Current Conditions at
CUTBANK - (KCTB)
45°
Feels like 36°F
Clear
as of 1:56 AM MST
Rel. Humidity: 56%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.35 in.
Flight Rule: VFR
Wind Data
22 MPH
Gust: 33 MPH
230° Southwest
Cloud Level(s): Clear
50% chance of snow Overnight Overnight... A 50 percent chance of snow. Cloudy, with a low around 39. South wind 15 to 17 mph, with gusts as high as 34 mph. Little or no snow accumulation expected.
50% chance of snow Wednesday Wednesday... A 50 percent chance of snow. Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 47 by 8am, then falling to around 37 during the remainder of the day. Windy, with a west southwest wind 20 to 25 mph increasing to 27 to 32 mph in the morning. Winds could gust as high as 55 mph. Little or no snow accumulation expected.
30% chance of snow Wednesday Night Wednesday Night... A 30 percent chance of snow. Mostly cloudy, with a low around 33. Breezy, with a south southwest wind 17 to 22 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 31 mph. Little or no snow accumulation expected.
50% chance of snow Thursday Thursday... A 50 percent chance of snow. Cloudy, with a high near 43. South southwest wind 6 to 9 mph. Little or no snow accumulation expected.
50% chance of snow Thursday Night Thursday Night... A 50 percent chance of snow. Cloudy, with a low around 36. South southwest wind 9 to 14 mph, with gusts as high as 30 mph. Little or no snow accumulation expected.
50% chance of snow Friday Friday... A 50 percent chance of snow. Mostly cloudy, with a high near 44. New snow accumulation of less than a half inch possible.
50% chance of snow Friday Night Friday Night... A 50 percent chance of snow. Mostly cloudy, with a low around 30. New snow accumulation of less than a half inch possible.
20% chance of snow Saturday Saturday... A chance of snow. Mostly cloudy, with a high near 38.
20% chance of snow Saturday Night Saturday Night... A chance of snow. Mostly cloudy, with a low around 30.
20% chance of snow Sunday Sunday... A chance of snow. Partly sunny, with a high near 39.
20% chance of snow Sunday Night Sunday Night... A chance of snow. Mostly cloudy, with a low around 31.
20% chance of snow Monday Monday... A chance of snow. Mostly cloudy, with a high near 42.
20% chance of snow Monday Night Monday Night... A chance of snow. Mostly cloudy, with a low around 29.
20% chance of snow Tuesday Tuesday... A chance of snow. Partly sunny, with a high near 37.
Current Radar Image


Sun Almanac for Big Arm, Montana
Sunrise: 08:21 AM
Sunset: 4:46 PM
Civil Sunrise:07:45 AM
Civil Sunset: 5:22 PM
Nautical Sunrise: 07:06 AM
Nautical Sunset: 6:01 PM
Astro Sunrise: 06:28 AM
Astro Sunset: 6:39 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.