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St. John Church, SD Weather Forecast
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St. John Church Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  | | | |  | |  | | |
| Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers |
| Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°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: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C |
| POP: 100% | POP: 50% | POP: 20% | POP: 20% | POP: 60% | POP: 70% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 439 PM CDT Thu Sep 17 2026 
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Issued: 305 PM CDT Thu Sep 17 2026
Key Messages
- Showers and thunderstorms will lift through the area starting tonight. While severe weather is not expected, locally heavy rainfall will be the main threat. Widespread accumulations of 1-2+ inches are expected along and north of I-90. Locally higher amounts are also possible, potentially exceeding 4+ inches. Minor impacts to rivers and streams, ponding in poor drainage areas, and urban street flooding are all possible.
- A low end severe storm threat is possible Friday afternoon and ev...