Marine Weather and Tide Forecast for Polson, MT
 | Sunrise 5:36 AM Sunset 9:39 PM Moonrise 3:35 AM Moonset 9:01 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
7 Day Forecast for Marine Location Near Polson, MT
NEW! Add second zone forecast
FXUS65 KMSO 131916 AFDMSO
Area Forecast Discussion National Weather Service Missoula MT 116 PM MDT Sat Jun 13 2026
DISCUSSION
KEY MESSAGES:
- High pressure this weekend into early next week bringing warming trend, with 80s for western Montana and mid-upper 90s for central Idaho.
- West-northwest flow pattern by middle of next week, opening the door for periodic disturbances, showers, and thunderstorms.
Satellite images this afternoon shows shallow cumulus clouds developing along the Continental Divide and the higher terrain of western Montana. Forecast soundings point towards mid-level instability increasing along the divide by mid-late afternoon, setting the stage for isolated shower activity across the higher terrain. By this evening, an easterly pressure gradient will increase, with east-northeast wind gusts of 15-25 mph across western Montana valley areas around sunset through midnight.
Model ensembles are in strong agreement (90% confidence in cluster analysis) for high pressure to build and shift inland along the Pacific Northwest this weekend into early next week. This leaves the Northern Rockies positioned under west-northwest flow aloft with strong subsidence and warming to our west. Valley temperatures will reach into the upper-70s and 80s across western Montana. Extreme low elevation river valleys of central Idaho will push into the mid- to-upper 90s by Tuesday.
The flow becomes northwesterly by Tuesday and Wednesday. This will bring windy conditions to the region as a shortwave trough moves along the Canadian border in northwest Montana. Confidence has increased for wind gusts greater than 30 mph Tuesday afternoon across western Montana valleys, with probabilities reaching 70-90%. Those with outdoor recreation plans should monitor the forecast closely especially for area lakes and the higher terrain. The strongest gusts (50-60 mph) will focus across the Bitterroot Crest and mountain ranges along the Continental Divide.
Furthermore, the combination of warm, dry, and windy conditions will bring elevated fire weather concerns along and east of the divide in southwest Montana.
As discussed previously, forecast uncertainty begins to increase by Thursday and Friday of next week. Despite this, it appears that temperatures will generally stay above average. Ensemble cluster analysis suggests a slight chance (15-20% probability) for upper level disturbances to bring showers and a few thunderstorms. Around 50 percent of the ensemble model clusters depict a deeper trough over the Pacific Northwest by Friday. This type of pattern could support strong thunderstorms heading into next weekend.
AVIATION
A north-northeast gradient has developed across the Northern Rockies this afternoon, with high pressure east of the divide. Shallow moisture and instability is leading to cumulus clouds along the divide and mountain areas of western Montana.
High-resolution guidance along with forecast soundings suggest isolated shower activity across the divide by mid-afternoon through early evening. Showers will struggle to move off the terrain, with valley areas staying mostly dry. Winds will become east-northeast around sunset through midnight, with gusts reaching 15-20kts along the divide.
MSO WATCHES/WARNINGS/ADVISORIES
MT...None.
ID...None.
Area Forecast Discussion National Weather Service Missoula MT 116 PM MDT Sat Jun 13 2026
DISCUSSION
KEY MESSAGES:
- High pressure this weekend into early next week bringing warming trend, with 80s for western Montana and mid-upper 90s for central Idaho.
- West-northwest flow pattern by middle of next week, opening the door for periodic disturbances, showers, and thunderstorms.
Satellite images this afternoon shows shallow cumulus clouds developing along the Continental Divide and the higher terrain of western Montana. Forecast soundings point towards mid-level instability increasing along the divide by mid-late afternoon, setting the stage for isolated shower activity across the higher terrain. By this evening, an easterly pressure gradient will increase, with east-northeast wind gusts of 15-25 mph across western Montana valley areas around sunset through midnight.
Model ensembles are in strong agreement (90% confidence in cluster analysis) for high pressure to build and shift inland along the Pacific Northwest this weekend into early next week. This leaves the Northern Rockies positioned under west-northwest flow aloft with strong subsidence and warming to our west. Valley temperatures will reach into the upper-70s and 80s across western Montana. Extreme low elevation river valleys of central Idaho will push into the mid- to-upper 90s by Tuesday.
The flow becomes northwesterly by Tuesday and Wednesday. This will bring windy conditions to the region as a shortwave trough moves along the Canadian border in northwest Montana. Confidence has increased for wind gusts greater than 30 mph Tuesday afternoon across western Montana valleys, with probabilities reaching 70-90%. Those with outdoor recreation plans should monitor the forecast closely especially for area lakes and the higher terrain. The strongest gusts (50-60 mph) will focus across the Bitterroot Crest and mountain ranges along the Continental Divide.
Furthermore, the combination of warm, dry, and windy conditions will bring elevated fire weather concerns along and east of the divide in southwest Montana.
As discussed previously, forecast uncertainty begins to increase by Thursday and Friday of next week. Despite this, it appears that temperatures will generally stay above average. Ensemble cluster analysis suggests a slight chance (15-20% probability) for upper level disturbances to bring showers and a few thunderstorms. Around 50 percent of the ensemble model clusters depict a deeper trough over the Pacific Northwest by Friday. This type of pattern could support strong thunderstorms heading into next weekend.
AVIATION
A north-northeast gradient has developed across the Northern Rockies this afternoon, with high pressure east of the divide. Shallow moisture and instability is leading to cumulus clouds along the divide and mountain areas of western Montana.
High-resolution guidance along with forecast soundings suggest isolated shower activity across the divide by mid-afternoon through early evening. Showers will struggle to move off the terrain, with valley areas staying mostly dry. Winds will become east-northeast around sunset through midnight, with gusts reaching 15-20kts along the divide.
MSO WATCHES/WARNINGS/ADVISORIES
MT...None.
ID...None.
Link to 5 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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