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Legion Lake, SD Weather Forecast
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Legion Lake Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | | |  |  | | | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 80°FHi: 27°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C |
| POP: 40% | POP: 60% | POP: 50% | POP: 30% | POP: 20% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 547 PM MDT Mon Aug 17 2026 
Legion Lake Radar Loop
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Legion Lake Weather Map
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Legion Lake Forecast Discussion
Issued: 528 PM MDT Mon Aug 17 2026
Key Messages
- Active pattern persists through mid-week with daily chances of storms, some of which may be strong to severe.
- Trending warmer to end the week into next weekend.
Discussion
...(This Evening Through Monday) Issued at 1200 PM MDT Mon Aug 17 2026
Upper level analysis depicts near-zonal flow over the central US. Upper level moisture associated with a weak wave is making its way over the Northern Plains, resulting in mid to high level cloud cover and scattered sh...