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Capitol Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Rain Showers | Rain Showers | Clouds | Partly Cloudy | Clouds | Partly Cloudy | Chance of T-Storm | Mostly Clear | Sunny |
| Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 60°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C |
| POP: 50% | POP: 90% | POP: 90% | POP: 100% | POP: 60% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 350 PM MDT Fri Sep 18 2026 
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Issued: 141 PM MDT Fri Sep 18 2026
Key Messages
- A few strong thunderstorms are possible over southeast Montana this evening.
- Flood Watch this evening through Sunday for much of the area. Widespread precipitation this afternoon through the weekend, with potential for locally heavy rainfall through Saturday night.
- Widespread 50-95% chance of an inch of rainfall. 50-80% chance of two inches of rainfall for portions of south central Montana.
Discussion
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Today through Thursday...
Showers and embedded thunderstorms will move in from the ...