Big Sky, MT Weather Forecast
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| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
| Windy | Snow Showers | Mostly Sunny | Mostly Clear | Sunny | Partly Cloudy | Partly Cloudy | Mostly Clear | Chance of T-Storm | Chance of Showers | Rain Showers | Mostly Clear |
| Hi: 65°FHi: 18°C | Lo: 35°FLo: 2°C | Hi: 54°FHi: 12°C | Lo: 33°FLo: 1°C | Hi: 61°FHi: 16°C | Hi: 60°FHi: 16°C Lo: 37°FLo: 3°C | Hi: 60°FHi: 16°C Lo: 37°FLo: 3°C | Lo: 36°FLo: 2°C | Hi: 63°FHi: 17°C | Lo: 39°FLo: 4°C | Hi: 64°FHi: 18°C | Hi: 67°FHi: 19°C Lo: 40°FLo: 4°C |
| POP: 50% | POP: 40% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 336 AM MDT Sun Sep 13 2026 

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Issued: 1113 AM MDT Sun Sep 13 2026
Key Messages
- Windy at times today through Monday.
- Increasing chance for showers and thunderstorms this afternoon into this evening.
- Cooler afternoon temperatures early this week will give way to warmer and drier conditions next weekend.
Discussion
... /Issued 355 AM MDT Sun Sep 13 2026/- Meteorological Overview: A closed upper level low is approaching Montana from the west this morning. Thus expect increasing clouds this afternoon, along with increasing chances for showers/thunderstorms by this even...
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