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Trail Lake Weather Forecast
| REST OF TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  |  |  | | | | | | | | |
| Sunny | Mostly Clear | Increasing Clouds | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 69°FHi: 21°C | Lo: 31°FLo: -1°C | Hi: 69°FHi: 21°C | Lo: 35°FLo: 2°C | Hi: 71°FHi: 22°C | Lo: 35°FLo: 2°C | Hi: 65°FHi: 18°C | Lo: 35°FLo: 2°C | Hi: 71°FHi: 22°C | Lo: 39°FLo: 4°C | Hi: 71°FHi: 22°C | Lo: 39°FLo: 4°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1238 PM MDT Wed Sep 30 2026 
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Issued: 1239 PM MDT Wed Sep 30 2026
Key Messages
- Cooler with periodic light showers over the plains late tonight through Thursday night.
- Dry and mild Friday through much of next week.
Discussion
...
Through next Wednesday...
Cold front continues to drop thru northern MT and a shift to northerly winds will reach Judith Gap-Rock Springs soon. Billings will see NE winds by late afternoon. There is currently a west- to-east oriented post-frontal band of light showers across the high line. Mid level frontogenesis in this area will sag south...