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McCoy Lake, SD Weather Forecast
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McCoy Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  | |  |  |  | | | | | | |
| Partly Sunny | Chance of T-Storm | Partly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Chance of T-Storm |
| Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 549 AM CDT Sun Aug 23 2026 
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McCoy Lake Forecast Discussion
Issued: 632 AM CDT Sun Aug 23 2026
Key Messages
- Scattered showers and a few storms are likely early this morning in south-central South Dakota, with some lingering activity possible into the afternoon. Severe weather is not expected, but locally heavy rainfall will be possible during any afternoon storm.
- The next better chance for showers and storms across a wider part of the area is tonight (50-70%). Locally heavy rain and isolated severe storms are possible.
- Otherwise most days through next week will see highs in the 80s and low...