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St. Johns Lake, WI Weather Forecast
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St. Johns Lake Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SUNDAY |
 |  |  |  |  |  |  | | | |
| Chance of T-Storm | Chance of T-Storm | Patchy Fog | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 60°FLo: 16°C | Hi: 85°FHi: 29°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C |
| POP: 40% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 558 AM CDT Mon Aug 31 2026 
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Issued: 704 AM CDT Mon Aug 31 2026
Key Messages
- Isolated showers and a few non-severe storms this morning. Small chance (20-30%) for showers and storms this afternoon and evening. If storms develop, they may become strong or severe, capable of producing hail, damaging winds, and torrential downpours.
- Warm, humid conditions continue into Tuesday. Heat indices in the 90s expected this afternoon, and again for some locations on Tuesday.
- Conditional threat for hazardous boating and swimming conditions on Lake Michigan this afternoon. ...