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Mount Vernon, SD Weather Forecast
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Mount Vernon Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  | | | |  |  | |  |  | | |
| Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Chance of T-Storm | Partly Sunny | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of T-Storm | Chance of Showers |
| Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 61°FHi: 16°C |
| POP: 70% | POP: 50% | POP: 20% | POP: 70% | POP: 70% | POP: 50% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 339 PM CDT Wed Sep 23 2026 
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Issued: 220 PM CDT Wed Sep 23 2026
Key Messages
- Breezy southeast winds are ongoing, mostly west of I-29 today. Frequent gusts of 25-35 mph are expected with isolated gusts to 40 mph possible.
- Showers and thunderstorms develop over central South Dakota late this afternoon into the evening. Storms will slowly progress east through the overnight and into Thursday afternoon. The main concern will be brief heavy downpours, though flooding is not expected.
- The active weather pattern continues bringing a high chance (>60%) of additional ...