Marine Weather and Tide Forecast for Polson, MT
 | Sunrise 8:03 AM Sunset 4:48 PM Moonrise 1:50 PM Moonset 1:11 AM |
Marine Forecasts
NOTE: Zones were updated 3/20/2025. If your report is out of date, please click Edit
7 Day Forecast for Marine Location Near Polson, MT
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FXUS65 KMSO 290906 AFDMSO
Area Forecast Discussion National Weather Service Missoula MT 206 AM MST Sat Nov 29 2025
DISCUSSION
KEY MESSAGES:
- Possible lake-effect snow on the south end of Flathead Lake this morning.
- The coldest temperatures of the season are expected this weekend.
- Light snow tonight into Sunday morning, with more significant snow expected Monday night into Wednesday morning.
- Overall, the weather will remain unsettled through the rest of the week.
The very cold air will continue to move into the Northern Rockies through this weekend, causing the coldest temperatures of the season. Valley locations north of I-90 will likely see patchy fog early this morning.
Light northerly winds will continue across Flathead Lake. A few mountain passes and canyons may maintain an easterly wind, keeping wind chills colder. The cold air flowing over the warm open waters could create lake-effect snow from the Narrows south to Polson through this morning.
A weak weather system is anticipated to swing through the Northern Rockies tonight into Sunday morning. This system is expected to bring light snow to north-central Idaho and parts of west-central Montana, with accumulations up to 2 inches in parts of Idaho County.
Another weather system is expected to move southward out of Canada across the Northern Rockies late Monday night into Wednesday morning. Snow will likely fall down to the valley floors across most of the region, allowing for light snow accumulations even in the lower valleys of Idaho and Clearwater Counties. Minor to moderate travel impacts are anticipated with this system: 3 to 5 inches of snow across area passes and 1 to 3 inches for valleys north of I-90. Valleys for the rest of western Montana will likely see a trace to 1 inch, including north-central Idaho valleys (Orofino to Grangeville).
This active weather pattern is anticipated to continue through the remainder of the week into next weekend.
AVIATION
Snowfall has largely ended across the Northern Rockies this morning, leaving behind some of the coldest temperatures the region has experienced this season. Locations along and south of I-90 will keep a mid-level cloud deck through mid-morning, before becoming partly cloudy with high clouds this afternoon. Clearing skies overnight may result in patchy fog for the valleys north of I-90, including KGPI through 29/1600Z this morning. Another weather weather system will bring widespread very light snow to the region tonight through early Sunday morning.
MSO WATCHES/WARNINGS/ADVISORIES
MT...None.
ID...None.
Area Forecast Discussion National Weather Service Missoula MT 206 AM MST Sat Nov 29 2025
DISCUSSION
KEY MESSAGES:
- Possible lake-effect snow on the south end of Flathead Lake this morning.
- The coldest temperatures of the season are expected this weekend.
- Light snow tonight into Sunday morning, with more significant snow expected Monday night into Wednesday morning.
- Overall, the weather will remain unsettled through the rest of the week.
The very cold air will continue to move into the Northern Rockies through this weekend, causing the coldest temperatures of the season. Valley locations north of I-90 will likely see patchy fog early this morning.
Light northerly winds will continue across Flathead Lake. A few mountain passes and canyons may maintain an easterly wind, keeping wind chills colder. The cold air flowing over the warm open waters could create lake-effect snow from the Narrows south to Polson through this morning.
A weak weather system is anticipated to swing through the Northern Rockies tonight into Sunday morning. This system is expected to bring light snow to north-central Idaho and parts of west-central Montana, with accumulations up to 2 inches in parts of Idaho County.
Another weather system is expected to move southward out of Canada across the Northern Rockies late Monday night into Wednesday morning. Snow will likely fall down to the valley floors across most of the region, allowing for light snow accumulations even in the lower valleys of Idaho and Clearwater Counties. Minor to moderate travel impacts are anticipated with this system: 3 to 5 inches of snow across area passes and 1 to 3 inches for valleys north of I-90. Valleys for the rest of western Montana will likely see a trace to 1 inch, including north-central Idaho valleys (Orofino to Grangeville).
This active weather pattern is anticipated to continue through the remainder of the week into next weekend.
AVIATION
Snowfall has largely ended across the Northern Rockies this morning, leaving behind some of the coldest temperatures the region has experienced this season. Locations along and south of I-90 will keep a mid-level cloud deck through mid-morning, before becoming partly cloudy with high clouds this afternoon. Clearing skies overnight may result in patchy fog for the valleys north of I-90, including KGPI through 29/1600Z this morning. Another weather weather system will bring widespread very light snow to the region tonight through early Sunday morning.
MSO WATCHES/WARNINGS/ADVISORIES
MT...None.
ID...None.
Link to 1 hour of 5 minute data for KGPI
Terminal Aerodrome Forecast (TAF) for KGPI
Wind History Graph: GPI
(wind in knots)
GEOS Local Image of Pacific Northwest
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