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Clark County, SD Weather Forecast
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Clark County Weather Forecast
| REST OF TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  | |  |  | | |  | | |
| Partly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Showers | Chance of Showers | Chance of Showers | Mostly Cloudy | Chance of Showers |
| Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Hi: 71°FHi: 22°C Lo: 50°FLo: 10°C |
| POP: 100% | POP: 90% | POP: 40% | POP: 40% | POP: 70% | POP: 40% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1122 AM CDT Thu Sep 17 2026 
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Issued: 1042 AM CDT Thu Sep 17 2026
Key Messages
-Heavy rain is expected beginning this afternoon and continuing through Friday evening. The highest accumulations are expected over eastern and central South Dakota. The probability to see two inches of rain or more reaches 40-60% over eastern and south central South Dakota (decreasing elsewhere as you move north and west).
-There is a Slight Risk (level 2 of 4) for excessive rainfall leading to flooding across across the forecast area today. The heaviest rainfall is expected overnigh...