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Halfmoon Lake Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
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| Rain | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Rain | Chance of T-Storm | Chance of Rain | Partly Cloudy | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy |
| Lo: 40°FLo: 4°C | Hi: 60°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 70°FHi: 21°C | Lo: 46°FLo: 8°C | Hi: 65°FHi: 18°C | Lo: 46°FLo: 8°C | Hi: 65°FHi: 18°C | Lo: 46°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 46°FLo: 8°C | Hi: 66°FHi: 19°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 PM MDT Tue Sep 15 2026 
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Issued: 254 PM MDT Tue Sep 15 2026
Discussion
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KEY MESSAGES:- Cool and showery conditions are expected from Yaak to Glacier National Park through this evening.
- Warming and drying trend expected through Wednesday.
- Shower and Thunderstorm pattern develops Thursday and continues into Saturday.
- Another warming and drying trend Sunday through early next week.
Satellite imagery this afternoon shows a large upper level low digging southwards from Vancouver Island towards northern California. To the east of this feature, a steady stream o...