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Rough Lake Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Mostly Clear | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Rain Showers | Partly Cloudy | Rain Showers |
| Lo: 31°FLo: -1°C | Hi: 69°FHi: 21°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 | Hi: 65°FHi: 18°C | Lo: 35°FLo: 2°C | Hi: 65°FHi: 18°C |
| POP: 20% | POP: 80% | POP: 30% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1049 PM MDT Mon Sep 21 2026 
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Issued: 649 PM MDT Mon Sep 21 2026
Key Messages
- Warmer and drier much of the work week. 80s return midweek.
- Scattered showers and storms late Tuesday into Wednesday.
Discussion
...
Rest of Today through Sunday...
Low clouds continue to clear over southeast Montana and portions of northern Wyoming this afternoon. Ridging will generally take over the pattern this week, bringing warmer and mostly dry conditions.
HiRes models show patchy fog developing along and north of I-90 from Billings to Livingston tonight. Coverage and density are ex...