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Ruby Reservoir, MT Weather Forecast
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Ruby Reservoir Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY |
 |  |  |  | |  | |  | | | |
| Sunny | Chance of T-Storm | Chance of T-Storm | Clearing | Mostly Sunny | Chance of Showers | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C |
| POP: 70% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 341 AM MDT Sun Sep 13 2026 
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Issued: 1248 AM MDT Sun Sep 13 2026
Key Messages
- Rain will be likely across northeast portions of Montana this evening through Monday afternoon. Precipitation totals will range between 0.01" and 0.25".
- A Lake Wind Advisory has been issued due to SE wind being expected to reach 20 to 25 mph sustained this afternoon. Wave heights have the potential to reach 3 ft.
- SW Winds will likely reach Lake Wind Advisory criteria again Monday afternoon. Wave heights have the potential to reach 4.5 ft.
Discussion
... Synoptic Setup: Forecast begins ...