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City of Sidney, MTSidney, MT Weather Forecast
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| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | SUNDAY NIGHT |
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| Partly Cloudy | Mostly Sunny | Chance of Showers | Chance of Showers | Mostly Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 81°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C Lo: 45°FLo: 7°C | Lo: 45°FLo: 7°C |
| POP: 30% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 336 PM MDT Mon Sep 21 2026 
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Issued: 152 PM MDT Mon Sep 21 2026
Key Messages
- Potential rain showers and thunderstorms (to a much lesser extent) in areas SE of the Missouri river between early morning and mid-afternoon Wednesday.
- Wind and precipitation forecasts for Friday and Saturday will continue to be monitored closely. Precipitation chances are currently uncertain and winds speeds are expected to be higher than current model guidance suggests.
Discussion
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SYNOPTIC SETUP:
The low pressure system that brought rain to Montana this past weekend is exiting east...