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Apache Reservoir, MT Weather Forecast
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Apache Reservoir Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  |  |  |  |  |  | | | | |
| Thunderstorms | Chance of T-Storm | Chance of T-Storm | Rain Showers | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Rain Showers | Partly Cloudy | Mostly Sunny | Mostly Clear |
| Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 59°FHi: 15°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 80°FHi: 27°C | Lo: 51°FLo: 11°C |
| POP: 80% | POP: 90% | POP: 100% | POP: 60% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 419 AM MDT Sat Sep 19 2026 
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Issued: 443 AM MDT Sat Sep 19 2026
Key Messages
- A few strong thunderstorms are possible over southeast Montana today.
- Flood Watch in effect through Sunday for much of the area. Widespread precipitation through the weekend, with potential for locally heavy rainfall through tonight.
- Widespread 50-95% chance of an inch of rainfall. 50-80% chance of two inches of rainfall for portions of south central Montana.
Discussion
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