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Custer County Weather Forecast
| EARLY THIS MORNING | TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 | |  | | | | |  |  |  | | |
| Clear | Sunny | Clear | Sunny | Clear | Sunny | Mostly Clear | Partly Cloudy | Chance of Rain | Chance of Rain | Chance of Rain | Partly Cloudy |
| Hi: 41°FHi: 5°C | Hi: 59°FHi: 15°C | Lo: 41°FLo: 5°C | Hi: 70°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 51°FHi: 11°C |
| POP: 20% | POP: 20% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 358 AM MDT Mon Oct 19 2026 
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Issued: 510 AM MDT Mon Oct 19 2026
Key Messages
- Warm and dry weather through much of this week.
Discussion
...(This Evening Through Sunday) Issued at 112 PM MDT Sun Oct 18 2026
Water vapor and upper air models show southwest flow over the region, as upper ridge sits to our east and an upper trough is located over the southwestern CONUS this afternoon. 18Z surface analysis shows a frontal boundary stretching from northeastern SD down into central WY, mostly through our forecast area now. Satellite shows clear skies over the forecast a...