Weather WorldUpper Boulder Lake, MT Weather Forecast
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Upper Boulder Lake Weather Forecast
| REST OF TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  | |  |  |  |  | | |  | |
| Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Rain | Chance of T-Storm | Snow and Rain | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Snow | Rain and Snow |
| Lo: 37°FLo: 3°C | Hi: 56°FHi: 13°C | Lo: 39°FLo: 4°C | Hi: 57°FHi: 14°C | Lo: 38°FLo: 3°C | Hi: 42°FHi: 6°C | Lo: 25°FLo: -4°C | Hi: 42°FHi: 6°C Lo: 25°FLo: -4°C | Hi: 42°FHi: 6°C Lo: 25°FLo: -4°C | Hi: 42°FHi: 6°C Lo: 25°FLo: -4°C | Lo: 29°FLo: -2°C | Hi: 46°FHi: 8°C |
| POP: 100% | POP: 100% | POP: 90% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 722 PM MDT Tue Oct 20 2026 
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Issued: 1143 PM MDT Tue Oct 20 2026
Key Messages
- Temperatures will return to unseasonably warm levels on Wednesday and continue until a period of cooler than average temperatures beginS Friday, which continueS through the beginning of the following week.
- Pacific system will bring rain and mountain snow beginning Thursday night and continuing through early Saturday morning.
- Gusty winds develop Friday afternoon and continue through Friday night with the highest gusts along the Rocky Mountain Front and Central MT.