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Jefferson Island, Montana Weather Forecast
Jefferson Island, Montana Weather
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Click for High Wind Warning for Jefferson Island, Montana
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Weather Forecast for Jefferson Island, Montana : Madison County
Issued: 9:18 am MST Dec 17, 2025 Latitude: 45.8507602 Longitude: -111.9405424 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
Dust on Today Dust on Tonight 20% chance of snow on Thursday 70% chance of rain & snow on Friday 10% chance of snow on Saturday Mostly Sunny on Sunday 10% chance of rain & snow on Monday Partly Sunny on Tuesday
High: 36 °F Low: 25°F High: 45°F High: 53°F High: 41°F High: 43°F High: 50°F High: 46°F
Low: 36°F Low: 24°F Low: 20°F Low: 28°F Low: 27°F  
Dust Dust Snow Rain & Snow Snow Mostly Sunny Rain & Snow Partly Sunny
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Current Conditions at
BOZEMAN - (KBZN)
43°
Feels like 33°F
Cloudy
Light Rain
as of 10:26 AM MST
Rel. Humidity: 81%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 29.36 in.
Flight Rule: VFR
Wind Data
24 MPH
Gust: 39 MPH
270° West
Cloud Level(s): Solid Overcast at 3400ft
Current Conditions at
HELENA - (KHLN)
43°
Feels like 33°F
Cloudy
Light Rain
as of 10:02 AM MST
Rel. Humidity: 75%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.29 in.
Flight Rule: VFR
Wind Data
22 MPH
Gust: 32 MPH
260° West
Cloud Level(s): Broken at 3300ft, Broken at 4900ft, Solid Overcast at 6000ft
Dust on Today Today... Patchy blowing dust. Mostly sunny, with a temperature falling to around 36 by 5pm. Windy, with a west wind 32 to 36 mph, with gusts as high as 55 mph.
Dust on Tonight Tonight... Patchy blowing dust before 8pm. Partly cloudy, with a low around 25. Breezy, with a west wind 18 to 28 mph decreasing to 8 to 18 mph after midnight. Winds could gust as high as 49 mph.
20% chance of snow Thursday Thursday... A 20 percent chance of snow after 11am. Cloudy, with a high near 45. Southwest wind 6 to 14 mph, with gusts as high as 23 mph.
40% chance of rain & snow Thursday Night Thursday Night... A chance of rain and snow before 11pm, then a chance of rain. Mostly cloudy, with a low around 36. Southwest wind 13 to 16 mph, with gusts as high as 33 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
70% chance of rain & snow Friday Friday... Snow likely, possibly mixed with rain. Mostly cloudy, with a high near 53. Southwest wind 13 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
50% chance of rain & snow Friday Night Friday Night... A chance of rain and snow before 8pm, then a chance of snow. Mostly cloudy, with a low around 24. West southwest wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
10% chance of snow Saturday Saturday... A 10 percent chance of snow before 11am. Mostly sunny, with a high near 41. West southwest wind 7 to 14 mph, with gusts as high as 24 mph.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 20. West southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 43.
10% chance of rain & snow Sunday Night Sunday Night... A slight chance of rain and snow after 11pm. Mostly cloudy, with a low around 28.
10% chance of rain & snow Monday Monday... A slight chance of rain and snow. Mostly cloudy, with a high near 50.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 27.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 46.
Current Radar Image


Sun Almanac for Jefferson Island, Montana
Sunrise: 08:04 AM
Sunset: 4:44 PM
Civil Sunrise:07:30 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.