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Island School, SD Weather Forecast
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Island School Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  | | |  |  | |  | |  | | |
| Chance of T-Storm | Mostly Sunny | Chance of T-Storm | Sunny | Partly Cloudy | Chance of Showers | Chance of T-Storm | Clearing | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny |
| Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C |
| POP: 50% | POP: 20% | POP: 20% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 945 PM CDT Thu Aug 20 2026 
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Island School Forecast Discussion
Issued: 211 PM CDT Thu Aug 20 2026
Key Messages
- Isolated thunderstorms could develop this afternoon and evening. IF storms are able to develop, two+ inch hail and 50-70 mph winds are the main hazards. An isolated tornado is also possible.
- Warmer temperatures continue on Friday, with another low chance (20-30%) for thunderstorms in the afternoon and evening along and south of the Missouri River.
- Slightly cooler weather for the weekend. Saturday should remain dry with rain chances (40-70%) returning to ...