Weather WorldLost Lake, MT Weather Forecast
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Lost Lake Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  |  |  |  |  |  | | |  | |
| Partly Cloudy | Partly Cloudy | Chance of Rain | Chance of Rain | Mostly Cloudy | Chance of Rain | Chance of T-Storm | Rain | Chance of Rain | Chance of Rain | Mostly Clear | Partly Cloudy |
| Lo: 46°FLo: 8°C | Hi: 76°FHi: 24°C | Lo: 46°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 40°FLo: 4°C | Hi: 55°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 60°FHi: 16°C | Lo: 36°FLo: 2°C | Hi: 66°FHi: 19°C |
| POP: 50% | POP: 20% | POP: 20% | POP: 80% | POP: 90% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 PM MDT Wed Sep 09 2026 
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Issued: 1232 PM MDT Wed Sep 9 2026
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KEY MESSAGES:- Today and Thursday will be the warmest days before the change back to fall-like weather.
- Choppy lake conditions on lakes for Thursday due to westerly winds between 15 and 25 mph, and locally higher speeds expected over the Divide.
- Stiff northeast winds are possible Friday night through Saturday creating choppy conditions on area lakes.
- Cutoff Low brings widespread rain, with snow above 6000 feet Saturday night into Sunday.
Northwesterly flow aloft behind a departing tro...