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| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  | | | |  |  |  |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Rain Showers | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Sunny |
| Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 71°FHi: 22°C | Lo: 41°FLo: 5°C | Hi: 79°FHi: 26°C | Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 45°FLo: 7°C | Hi: 81°FHi: 27°C |
| POP: 80% | POP: 100% | POP: 90% | POP: 80% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 350 PM MDT Fri Sep 18 2026 
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Issued: 657 PM MDT Fri Sep 18 2026
Key Messages
- A few strong thunderstorms are possible over southeast Montana this evening.
- Flood Watch this evening through Sunday for much of the area. Widespread precipitation this afternoon through the weekend, with potential for locally heavy rainfall through Saturday night.
- 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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Today through Thursday...
Showers and embedded thunderstorms will move in from the ...