Simms, MT Weather Forecast
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| REST OF TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Clearing | Sunny | Windy | Windy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 55°FHi: 13°C Lo: 39°FLo: 4°C |
| POP: 100% | POP: 100% | POP: 50% | POP: 70% | POP: 40% | POP: 30% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1012 PM MDT Sun Sep 06 2026 

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Issued: 550 PM MDT Sun Sep 6 2026
Key Messages
- Scattered to widespread showers and thunderstorms develop this evening along and north of Highway 200, with isolated large hail possible.
- Periods of widespread rainfall Monday and Tuesday, with periods of moderate to heavy rainfall across Rocky Mountain Front and Sweet Grass Hills.
- Drier conditions Wednesday and Thursday.
- Another round of precipitation for next weekend.
Discussion
... /Issued 218 PM MDT Sun Sep 6 2026/- Meteorological Overview:
A passing shortwave will develop scattered ...
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