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St. Peter Weather Forecast
| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Sunny | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Showers Likely | Chance of Showers | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Cloudy |
| Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C |
| POP: 20% | POP: 50% | POP: 80% | POP: 60% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 300 PM EDT Fri Aug 21 2026 
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St. Peter Forecast Discussion
Issued: 208 PM EDT Fri Aug 21 2026
Key Messages
1) Trending seasonably cooler this weekend into early next week with showery periods Saturday and Sunday
Discussion
... KEY MESSAGE 1: Trending seasonably cooler this weekend into early next week with showery periods Saturday and Sunday
Large scale trough amplification expected over the Great Lakes region this weekend into early next week will spell a modest to seasonable cooling trend with showery periods Saturday and Sunday. The cyclonic flow may keep showers downwind of Lake Erie int...