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St. Mary's Lake Weather Forecast
| REST OF TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  | |  |  | |  | | |  | |
| Chance of Showers | Partly Cloudy | Mostly Clear | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Showers | Chance of T-Storm |
| Lo: 70°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C |
| POP: 20% | POP: 70% | POP: 70% | POP: 30% | POP: 20% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 227 AM EDT Mon Aug 17 2026 
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St. Mary's Lake Forecast Discussion
Issued: 346 AM EDT Mon Aug 17 2026
Key Messages
- Isolated showers and storms will slowly exit our area this morning.
- The next chance of rain arrives Tuesday night into Wednesday. Severe weather is not expected and the risk of heavy rain is currently low.
- There is a moderate swim risk for southern Lake Michigan beaches today.
Discussion
... Issued at 346 AM EDT Mon Aug 17 2026
Isolated showers and storms continue this morning thanks to one last remnant MCV ejecting out of IA/IL and a weak surface cold fron...