Weather WorldPost Lake, SD Weather Forecast
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Post Lake Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT |
 |  |  |  | |  | | |  | | | |
| Partly Cloudy | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Sunny | Chance of T-Storm | Partly Sunny | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm |
| Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C |
| POP: 50% | POP: 50% | POP: 70% | POP: 20% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 907 PM CDT Fri Aug 21 2026 
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Issued: 754 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...