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Lake Sinai, SD Weather Forecast
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Lake Sinai Weather Forecast
| REST OF TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  |  |  | | | | | |  |  |  |
| Chance of T-Storm | Mostly Sunny | Mostly Clear | Clearing | Mostly Clear | Sunny | Mostly Clear | Sunny | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers |
| Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C |
| POP: 40% | POP: 40% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 133 AM CDT Wed Sep 02 2026 
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Issued: 259 AM CDT Wed Sep 2 2026
Key Messages
- Scattered showers and thunderstorms remain possible late tonight into Thursday morning. Severe weather should remain isolated.
- Temperatures remain well above normal through the rest of this week and into the upcoming weekend, with highs in the 90s possible by mid-late week.
- The heat and humidity may bring occasional risks for isolated overnight thunderstorms. Exact locations of storms remain uncertain.
Discussion
... Issued at 111 PM CDT Tue Sep 1 2026
THIS AFTERNOON: A complex convecti...