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Capitol Weather Forecast
| REST OF TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  |  | | | | |  |  |  | | |
| Patchy Fog | Chance of T-Storm | Rain Showers | Chance of T-Storm | Rain Showers | Rain Showers | Patchy Fog | Mostly Cloudy | Clouds | Partly Cloudy | Rain Showers | Chance of T-Storm |
| Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C |
| POP: 40% | POP: 80% | POP: 100% | POP: 100% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 703 AM MDT Fri Sep 18 2026 
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Issued: 538 AM MDT Fri Sep 18 2026
Key Messages
- A few strong thunderstorms are possible, mainly around and east of Billings this afternoon and evening.
- Flood Watch tonight through Sunday for much of the area. Widespread precipitation this afternoon through the weekend, with the potential for locally heavy rainfall widespread through Saturday night.
- Chance for at least an inch of rainfall is greater than 80 percent across much of southern Montana and northern Wyoming. The chance for at least 2 inches of rainfall is 50 to 80 percent...