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Suphellen Reservoir Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  | | |  |  | | |  | | |
| Mostly Clear | Sunny | Chance of Rain | Mostly Sunny | Chance of Rain | Chance of Rain | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Sunny |
| Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C |
| POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 336 PM MDT Wed Sep 16 2026 
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Issued: 545 PM MDT Wed Sep 16 2026
Key Messages
- Showers/thunderstorms arrive in SW MT late Thursday morning/early afternoon, then spread northward into central MT during the evening.
- There is the potential for strong storms Thursday through Saturday.
- Shift to drier and milder conditions beginning Sunday.
Discussion
... /Issued 1224 PM MDT Wed Sep 16 2026/- Meteorological Overview:
The next upper level trough moves into the area out of the west on Thursday. Due to the SW flow over central MT, there will be a resulting unstable airmass ...