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Union County, SD Weather Forecast
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Union County Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | COLUMBUS DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  | | |  | | | |  |  |  |  |
| Clear | Sunny | Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers |
| Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C |
| POP: 30% | POP: 50% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 239 PM CDT Fri Oct 09 2026 
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Issued: 1219 PM CDT Fri Oct 9 2026
Key Messages
- Near-Record Heat and Strong Winds: High temperatures may approach records alongside strong southwest winds of 35-45 mph Saturday. Highest winds along the Buffalo Ridge.
- Elevated Fire Danger and Blowing Dust: Saturday`s hot, dry, and windy conditions will lead to elevated fire danger and blowing dust potential. Farmers and travelers should be aware of localized visibility reductions and increased fire risks.
- Sharp Temperature Drop: A cold front arriving late Sunday will push temperatu...