Weather WorldSimmon Lake, SD Weather Forecast
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Simmon Lake Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT |
 |  |  |  |  | | | |  | | | |
| Chance of T-Storm | Mostly Sunny | Partly Cloudy | Partly Sunny | Chance of Showers | Mostly Cloudy | Chance of T-Storm | Partly Sunny | Mostly Clear | Mostly Clear | Partly Sunny | Chance of Showers |
| Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C |
| POP: 20% | POP: 50% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 507 PM CDT Fri Aug 21 2026 
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Simmon Lake Forecast Discussion
Issued: 630 PM CDT Fri Aug 21 2026
Key Messages
- Mainly dry conditions will continue through next Wednesday with temperatures around average for this time of year.
- There is a 30-60% chance for showers and thunderstorms during the day Sunday into early Sunday evening over central SD, expanding to northeastern SD/west central MN Sunday night while increasing to a 40-70% chance.
- There is a Marginal Risk (level 1 out of 5) of severe weather Sunday night over much of central to northeastern SD. Brief heavy rain, lighting, and strong win...