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Big Sag, Montana Weather Forecast
Big Sag, Montana Weather
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Weather Forecast for Big Sag, Montana : Chouteau County
Issued: 8:27 pm MST Dec 16, 2025 Latitude: 47.5977462 Longitude: -110.7135513 View on Google Maps

MouseOver for Detail Forecast
Tonight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
Mostly Cloudy on Tonight 50% chance of rain on Wednesday 20% chance of snow on Thursday 40% chance of rain & snow on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday 10% chance of rain & snow on Monday Partly Sunny on Tuesday
Low: 43°F High: 34 °F High: 47°F High: 48°F High: 39°F High: 40°F High: 43°F High: 42°F
Low: 24°F Low: 36°F Low: 21°F Low: 26°F Low: 27°F Low: 28°F  
Mostly Cloudy Rain Snow Rain & Snow Mostly Sunny Mostly Sunny Rain & Snow Partly Sunny
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Current Conditions at
GREAT FALLS - (KGTF)
48°
Feels like 40°F
Clear
as of 7:53 PM MST
Rel. Humidity: 49%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.72 in.
Flight Rule: VFR
Wind Data
24 MPH
Gust: 38 MPH
240° Southwest
Cloud Level(s): Clear
Current Conditions at
LEWISTOWN - (KLWT)
45°
Feels like 38°F
Cloudy
as of 7:54 PM MST
Rel. Humidity: 52%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.77 in.
Flight Rule: VFR
Wind Data
13 MPH
230° Southwest
Cloud Level(s): Solid Overcast at 8000ft
Current Conditions at
HAVRE - (KHVR)
41°
Feels like 34°F
Cloudy
as of 7:53 PM MST
Rel. Humidity: 65%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.70 in.
Flight Rule: VFR
Wind Data
10 MPH
270° West
Cloud Level(s): Solid Overcast at 9000ft
Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 43. Windy, with a south southwest wind 25 to 34 mph, with gusts as high as 46 mph.

50% chance of rain Wednesday Wednesday... A 50 percent chance of rain, mainly before 10am. Patchy blowing dust. Mostly cloudy, then gradually becoming sunny, with a temperature falling to around 34 by 5pm. Very windy, with a west wind 44 to 55 mph, with gusts as high as 70 mph.

Dust on Wednesday Night Wednesday Night... Patchy blowing dust before 9pm. Partly cloudy, with a low around 24. Windy, with a west northwest wind 36 to 41 mph decreasing to 26 to 31 mph after midnight. Winds could gust as high as 55 mph.

20% chance of snow Thursday Thursday... A 20 percent chance of snow after 11am. Increasing clouds, with a high near 47. Breezy, with a southwest wind 21 to 26 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 32 mph.

30% chance of rain Thursday Night Thursday Night... A 30 percent chance of rain, mainly after 5am. Mostly cloudy, with a low around 36. Windy, with a southwest wind 13 to 23 mph increasing to 26 to 36 mph after midnight. Winds could gust as high as 47 mph.

40% chance of rain & snow Friday Friday... A chance of rain and snow before 8am, then a chance of snow. Partly sunny, with a high near 48. Windy, with a west wind 31 to 36 mph decreasing to 23 to 28 mph in the afternoon. Winds could gust as high as 47 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

30% chance of snow Friday Night Friday Night... A 30 percent chance of snow, mainly before 11pm. Mostly cloudy, with a low around 21. West southwest wind 14 to 16 mph, with gusts as high as 22 mph. Little or no snow accumulation expected.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 39. West southwest wind 18 to 21 mph, with gusts as high as 28 mph.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 26.

Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 40.

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

10% chance of rain & snow Monday Monday... A slight chance of rain and snow. Partly sunny, with a high near 43.

10% chance of snow Monday Night Monday Night... A slight chance of snow. Mostly cloudy, with a low around 28.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 42.

Current Radar Image


Sun Almanac for Big Sag, Montana
Sunrise: 08:05 AM
Sunset: 4:32 PM
Civil Sunrise:07:29 AM
Civil Sunset: 5:08 PM
Nautical Sunrise: 06:50 AM
Nautical Sunset: 5:47 PM
Astro Sunrise: 06:13 AM
Astro Sunset: 6:25 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.