Weather WorldInterstate Ski Trail, MT Weather Forecast
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Interstate Ski Trail Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  |  | | |  |  | |  |  |  |
| Mostly Clear | Partly Cloudy | Clearing | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of Rain | Chance of Rain | Chance of Rain | Rain and Snow | Mostly Cloudy | Mostly Cloudy |
| Lo: 46°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 46°FLo: 8°C | Hi: 65°FHi: 18°C | Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 40°FLo: 4°C | Hi: 50°FHi: 10°C | Lo: 36°FLo: 2°C | Hi: 50°FHi: 10°C |
| POP: 20% | POP: 40% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1223 PM MDT Mon Sep 21 2026 
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Issued: 102 PM MDT Mon Sep 21 2026
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KEY MESSAGES:- Summer-like conditions this week
- Chance for showers/thunderstorms in Lemhi County and southwest Montana on Tuesday
- Cold front Friday to bring a change: showers and thunderstorms, gusty winds, then cooler, fall-like conditions this weekend.
- Frosty mornings to follow this weekend into early next week.
It will be a gorgeous week as temperatures rise into the 70s and 80s across the region, which will generally be 10 to 15 degrees above average for late September.
A low press...