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Custer County Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY |
 |  |  | | |  | | | | | | |
| Mostly Clear | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Sunny | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Lo: 45°FLo: 7°C | Hi: 72°FHi: 22°C | Lo: 45°FLo: 7°C | Hi: 76°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 76°FHi: 24°C Lo: 48°FLo: 9°C | Hi: 76°FHi: 24°C Lo: 48°FLo: 9°C | Hi: 78°FHi: 26°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 74°FHi: 23°C Lo: 47°FLo: 8°C | Hi: 74°FHi: 23°C Lo: 47°FLo: 8°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 PM MDT Wed Sep 30 2026 
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Issued: 1259 PM MDT Wed Sep 30 2026
Key Messages
- Prolonged Quiet Weather Period: High pressure and dry air will keep eastern Idaho completely dry with minimal cloud cover through the workweek, upcoming weekend, and into early October. Zonal flow aloft will hold daytime highs near late- September averages in the upper 60s to lower 70s across lower elevations through Wednesday.
- Unseasonable Late-Week Warmth: An amplifying Great Basin ridge will boost lower-elevation temperatures into the upper 70s and lower 80s starting Thursday and ...