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Round Lake, SD Weather Forecast
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Round Lake Weather Forecast
| REST OF TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  | | |  |  |  |  | | | | |
| Patchy Fog | Chance of Showers | Showers | Showers | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy | Chance of Showers |
| Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C | Hi: 61°FHi: 16°C Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C Lo: 49°FLo: 9°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C |
| POP: 90% | POP: 100% | POP: 70% | POP: 30% | POP: 50% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 922 AM CDT Thu Sep 17 2026 
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Issued: 621 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...