Weather WorldUpper Phyllis Lake, MT Weather Forecast
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Upper Phyllis Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  | |  |  | | | | | |
| Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Chance of Rain | Chance of T-Storm | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of Rain |
| Hi: 75°FHi: 24°C | Lo: 46°FLo: 8°C | Hi: 76°FHi: 24°C | Lo: 46°FLo: 8°C | Hi: 75°FHi: 24°C | Lo: 46°FLo: 8°C | Hi: 76°FHi: 24°C | Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C | Lo: 50°FLo: 10°C | Hi: 85°FHi: 29°C | Lo: 50°FLo: 10°C |
| POP: 30% | POP: 20% | POP: 40% | POP: 40% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1223 AM MDT Sun Aug 16 2026 
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Upper Phyllis Lake Forecast Discussion
Issued: 405 AM MDT Sun Aug 16 2026
Discussion
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KEY MESSAGES:
- Shower and thunderstorm activity will continue each afternoon through early next week.
- Warming and drying latter part of next week under a ridge of high pressure.
Even though a ridge of high pressure is trying to build over the area today a very subtle disturbance will move through the region kicking off another round of showers and thunderstorms. The coverage is not to be as extensive as yesterday but these storms will still be capable of ...