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Island Lake, SD Weather Forecast
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Island Lake Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  |  |  |  |  |  | | | | | |
| Patchy Fog | Mostly Clear | Sunny | Partly Cloudy | Partly Sunny | Chance of T-Storm | Chance of Showers | Partly Cloudy | Partly Sunny | Partly Cloudy | Sunny | Mostly Clear |
| Hi: 85°FHi: 29°C | Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 55°FLo: 13°C |
| POP: 70% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 649 AM CDT Fri Aug 21 2026 
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Island Lake Forecast Discussion
Issued: 624 AM CDT Fri Aug 21 2026
Key Messages
- Patchy fog, possibly locally dense, continues through mid morning. Visibility may drop below a mile at times.
- Low chances (less than 20%) for showers near and north of US Highway 14 this afternoon and evening. Low chances for thunderstorms in the late afternoon and into tonight along and south of the Missouri River. Severe weather risk is low.
- Slightly cooler weather for the weekend. Saturday should remain dry. Rain chances (40-70%) return to western portions of the area by Sunday mo...