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Upper Reservoir Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  | | | | | | |  | |  |
| Mostly Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Chance of Rain |
| Lo: 36°FLo: 2°C | Hi: 76°FHi: 24°C | Lo: 36°FLo: 2°C | Hi: 70°FHi: 21°C | Lo: 36°FLo: 2°C | Hi: 70°FHi: 21°C | Lo: 40°FLo: 4°C | Hi: 70°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C | Lo: 40°FLo: 4°C | Hi: 56°FHi: 13°C |
| POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 428 PM MDT Sun Oct 04 2026 
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Issued: 1206 PM MDT Sun Oct 4 2026
Discussion
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KEY MESSAGES:- Very warm start to the week, followed by mild conditions most of the week.
- Break down of the ridge coming next weekend.
- Snow potential coming late next weekend and early next week.
Forecast high temperatures are in the top 10 on Monday for Missoula and Butte and in the top 15 for Kalispell, all locations with more than 120 years of records. Then the ridge over the region this week starts to flatten out leading to zonal flow, or just straight west to east flow. The only ...