Marine Weather and Tide Forecast for Polson, MT
 | Sunrise 7:54 AM Sunset 6:51 PM Moonrise 12:00 AM Moonset 3:26 PM |
Marine Forecasts
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7 Day Forecast for Marine Location Near Polson, MT
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FXUS65 KMSO 141925 AFDMSO
Area Forecast Discussion National Weather Service Missoula MT 125 PM MDT Tue Oct 14 2025
DISCUSSION
KEY MESSAGES:
- Valley rain/snow and mountain snow showers for west-central and southwest Montana forecast area today.
- Seasonable temperatures with valley rain showers and light mountain snowfall Wednesday into Thursday for southwest Montana.
- Widespread rain chances increasing for Sunday, and a return to cooler temperatures on Monday.
The cloud cover that limited cooling overnight across much of the region will linger in the area through Wednesday afternoon. As a result, overnight low temperatures were raised slightly from the previous 24-hour forecast. Light to moderate snow will also continue into the evening hours along I-90 from Bonner to Deer Lodge, and along Highway 12 and 200 to the Continental Divide.
The weather pattern will remain unsettled into the middle of the week as a low-pressure system develops near Yellowstone from Wednesday into Thursday. This will bring another round of showers and high-elevation snow, mainly to southwest Montana and Lemhi County. In contrast, areas farther north and west, including northwest Montana and the remainder of north-central Idaho, are likely to stay mostly dry with seasonable valley temperatures.
Normal high temperatures this time of year are in the low to mid-50s in western Montana and the low 60s in north-central Idaho.
Heading into the weekend, model guidance indicates a dip in the jet stream approaching from the Pacific Northwest, though differences in its timing and strength still exist. The most likely scenario involves mild temperatures with isolated showers on Saturday and Sunday before the main system arrives late Sunday into Monday. This will usher in cooler temperatures and widespread precipitation into early next week. By Monday, models are in strong agreement that a deep trough will settle over the region, ensuring a continued period of cool and unsettled weather.
AVIATION
A weak disturbance continues to move across west central Montana this afternoon causing light to moderate precipitation especially near the Continental Divide. The precipitation is falling mainly as snow causing reduced visibility and obscured terrain. The precipitation is expected to diminish after sunset this evening. A low level stratus deck is expected to redevelop once again tonight, particularly across western Montana.
Another weak disturbance is expected to move into Lemhi county and southwest Montana Wednesday morning bringing more light precipitation that could impact KSMN and KBTM.
MSO WATCHES/WARNINGS/ADVISORIES
MT...None.
ID...None.
Area Forecast Discussion National Weather Service Missoula MT 125 PM MDT Tue Oct 14 2025
DISCUSSION
KEY MESSAGES:
- Valley rain/snow and mountain snow showers for west-central and southwest Montana forecast area today.
- Seasonable temperatures with valley rain showers and light mountain snowfall Wednesday into Thursday for southwest Montana.
- Widespread rain chances increasing for Sunday, and a return to cooler temperatures on Monday.
The cloud cover that limited cooling overnight across much of the region will linger in the area through Wednesday afternoon. As a result, overnight low temperatures were raised slightly from the previous 24-hour forecast. Light to moderate snow will also continue into the evening hours along I-90 from Bonner to Deer Lodge, and along Highway 12 and 200 to the Continental Divide.
The weather pattern will remain unsettled into the middle of the week as a low-pressure system develops near Yellowstone from Wednesday into Thursday. This will bring another round of showers and high-elevation snow, mainly to southwest Montana and Lemhi County. In contrast, areas farther north and west, including northwest Montana and the remainder of north-central Idaho, are likely to stay mostly dry with seasonable valley temperatures.
Normal high temperatures this time of year are in the low to mid-50s in western Montana and the low 60s in north-central Idaho.
Heading into the weekend, model guidance indicates a dip in the jet stream approaching from the Pacific Northwest, though differences in its timing and strength still exist. The most likely scenario involves mild temperatures with isolated showers on Saturday and Sunday before the main system arrives late Sunday into Monday. This will usher in cooler temperatures and widespread precipitation into early next week. By Monday, models are in strong agreement that a deep trough will settle over the region, ensuring a continued period of cool and unsettled weather.
AVIATION
A weak disturbance continues to move across west central Montana this afternoon causing light to moderate precipitation especially near the Continental Divide. The precipitation is falling mainly as snow causing reduced visibility and obscured terrain. The precipitation is expected to diminish after sunset this evening. A low level stratus deck is expected to redevelop once again tonight, particularly across western Montana.
Another weak disturbance is expected to move into Lemhi county and southwest Montana Wednesday morning bringing more light precipitation that could impact KSMN and KBTM.
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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