Lake Sinai, SD Weather Forecast
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Lake Sinai Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
| Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny |
| Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | 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: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C |
| POP: 20% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 529 PM CDT Mon Aug 31 2026 

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Issued: 700 PM CDT Mon Aug 31 2026
Key Messages
- Strong to severe storms look to return to the area tomorrow (Tuesday) between 6 pm to 2 am. Large hail up to the size of golf balls, damaging winds to 70 mph, and an isolated tornado are the main hazards. Some uncertainty regarding storm mode remains.
- Near to above normal temperatures look to continue through this week. Confidence continues to increase in further increasing temperatures and humidity for the end of this week and weekend.
- Low chances (15-30%) for rain will accompany in...
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