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Sinai, SD Weather Forecast
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Sinai Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  |  | | |  | | | | |
| Mostly Sunny | Partly Cloudy | Chance of Showers | Chance of T-Storm | Partly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 30% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 629 AM CDT Sun Aug 02 2026 
Sinai Radar Loop
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