url:
Portal, Montana Weather Forecast
Portal, Montana Weather
your sport, your way
Air Sports Net on FacebookAir Sports Net on Google +Air Sports Net on TwitterReceive RSS UpdatesReceive Email Updates

Change location by the zip code or city,state: or search for other weather forecast locations in Montana by name.
Weather Forecast for Portal, Montana : Jefferson County
Issued: 9:18 am MST Dec 17, 2025 Latitude: 46.3374295 Longitude: -112.1183343 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
30% chance of snow on Today Mostly Cloudy on Tonight 60% chance of snow on Thursday 90% chance of rain & snow on Friday 30% chance of snow on Saturday 10% chance of snow on Sunday 20% chance of rain & snow on Monday 10% chance of rain & snow on Tuesday
High: 26 °F Low: 22°F High: 37°F High: 40°F High: 31°F High: 35°F High: 40°F High: 38°F
Low: 31°F Low: 20°F Low: 20°F Low: 26°F Low: 23°F  
Snow Mostly Cloudy Snow Rain & Snow Snow Snow Rain & Snow Rain & Snow
-
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
Current Conditions at
BUTTE - (KBTM)
43°
Feels like 33°F
Mostly Clear
as of 9:53 AM MST
Rel. Humidity: 52%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 29.36 in.
Flight Rule: VFR
Wind Data
23 MPH
Gust: 43 MPH
260° West
Cloud Level(s): Few at 2100ft, Few at 3800ft
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
30% chance of snow Today Today... A 30 percent chance of snow, mainly before 3pm. Mostly sunny, with a temperature falling to around 26 by 5pm. Windy, with a west wind 33 to 36 mph, with gusts as high as 55 mph. Total daytime snow accumulation of less than a half inch possible.

Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 22. Windy, with a west wind 27 to 32 mph becoming south southwest 14 to 19 mph after midnight. Winds could gust as high as 48 mph.

60% chance of snow Thursday Thursday... Snow likely, mainly after 5pm. Mostly cloudy, with a high near 37. South wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

80% chance of rain & snow Thursday Night Thursday Night... Snow likely before 8pm, then rain, possibly mixed with snow. Low around 31. South southwest wind 14 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

90% chance of rain & snow Friday Friday... Rain and snow, becoming all snow after 8am. High near 40. West wind 15 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

60% chance of snow Friday Night Friday Night... Snow likely, mainly before 11pm. Mostly cloudy, with a low around 20. West wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

30% chance of snow Saturday Saturday... A 30 percent chance of snow, mainly before 11am. Mostly sunny, with a high near 31. West southwest wind 11 to 17 mph, with gusts as high as 26 mph. Little or no snow accumulation expected.

10% chance of snow Saturday Night Saturday Night... A slight chance of snow before 11pm. Partly cloudy, with a low around 20. Southwest wind around 11 mph, with gusts as high as 21 mph.

10% chance of snow Sunday Sunday... A slight chance of snow after 11am. Mostly sunny, with a high near 35.

20% chance of rain & snow Sunday Night Sunday Night... A chance of snow before 5am, then a chance of rain and snow. Mostly cloudy, with a low around 26.

20% chance of rain & snow Monday Monday... A chance of rain and snow. Partly sunny, with a high near 40.

10% chance of rain & snow Monday Night Monday Night... A slight chance of rain and snow. Mostly cloudy, with a low around 23.

10% chance of rain & snow Tuesday Tuesday... A slight chance of rain and snow. Partly sunny, with a high near 38.

Sun Almanac for Portal, Montana
Sunrise: 08:07 AM
Sunset: 4:43 PM
Civil Sunrise:07:32 AM
Civil Sunset: 5:18 PM
Nautical Sunrise: 06:54 AM
Nautical Sunset: 5:56 PM
Astro Sunrise: 06:17 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.