Weather WorldDuncan, MT Weather Forecast
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Duncan Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  | | |  |  | |  | | | |
| Smoke | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Mostly Clear | Partly Cloudy | Chance of T-Storm |
| Lo: 54°FLo: 12°C | Hi: 82°FHi: 28°C | Lo: 58°FLo: 14°C | Hi: 83°FHi: 28°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 74°FHi: 23°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Lo: 53°FLo: 12°C | Hi: 77°FHi: 25°C Lo: 54°FLo: 12°C |
| POP: 50% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 336 PM MDT Wed Aug 19 2026 
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Duncan Forecast Discussion
Issued: 305 PM MDT Wed Aug 19 2026
Key Messages
- Mostly dry today and Thursday, with thunderstorms returning to Southwestern Montana Friday.
- Additional thunderstorms expected Saturday, some of which could be strong and produce heavy rainfall.
- Temperatures will generally be seasonable, though above average temperatures are expected Friday and Saturday.
Discussion
...- Meteorological Overview:
Upper level ridging has continued to build across the Western US today, which has resulted in generally clear, albei...