St Ignatius, MT Weather Forecast
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St Ignatius Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
| Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Chance of Rain | Patchy Fog | Patchy Fog | Partly Cloudy | Chance of Rain | Chance of Rain | Chance of Rain | Chance of Rain |
| Hi: 50°FHi: 10°C | Lo: 35°FLo: 2°C | Hi: 46°FHi: 8°C | Lo: 30°FLo: -1°C | Hi: 46°FHi: 8°C | Lo: 30°FLo: -1°C | Hi: 46°FHi: 8°C | Lo: 30°FLo: -1°C | Hi: 46°FHi: 8°C | Lo: 30°FLo: -1°C | Hi: 40°FHi: 4°C | Lo: 26°FLo: -3°C |
| POP: 40% | POP: 40% | POP: 30% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 102 AM MST Thu Nov 12 2026 

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Issued: 131 PM MST Wed Nov 11 2026
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KEY MESSAGES:- Through Friday Fog & Low Cloud Potential: Strong high pressure increasing likelihood of valley inversions.
- Pattern Shift: A Pacific system will tap into atmospheric river moisture beginning Saturday, snow levels stay above 6000 feet and precipitation amounts light.
- Further cooling early to mid next week with potential for snow levels to lower further.
High pressure was sufficient enough to produce morning valley fog but low level mixing has broken inversions and dissipa...
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