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Custer, MT Weather Forecast
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Custer Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  | |  |  | |  |  | | |
| Clouds | Increasing Clouds | Thunderstorms | Thunderstorms | Thunderstorms | Chance of T-Storm | Chance of Showers | Clouds | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny |
| Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C |
| POP: 30% | POP: 80% | POP: 100% | POP: 90% | POP: 70% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 743 PM MDT Thu Sep 17 2026 
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Issued: 550 PM MDT Thu Sep 17 2026
Key Messages
- Isolated to scattered showers and thunderstorms this afternoon and evening. Locally heavy rain possible over SE Montana with any showers/thunderstorms.
- A few strong thunderstorms are possible, mainly around and east of Billings Friday afternoon and evening.
- Flood Watch Friday night through Sunday for much of the area. Widespread precipitation Friday afternoon through the weekend, with the potential for locally heavy rainfall widespread through Saturday night.
- Chance for at least an i...