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St. John Weather Forecast
| REST OF TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  | |  |  |  | | | |  | | |
| Partly Sunny | Mostly Cloudy | Mostly Cloudy | Clearing | Sunny | Mostly Clear | Sunny | Mostly Clear | Partly Sunny | Chance of Showers | Clouds | Partly Cloudy |
| Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 621 PM CDT Sat Sep 19 2026 
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Issued: 708 PM CDT Sat Sep 19 2026
Key Messages
- High chances for light rain south and west of the Missouri River this evening through Sunday afternoon.
- Cloudy, humid, and cool on Sunday, with highs in the mid 50s to mid 60s.
- Gradual warming trend through the upcoming work week, with highs mostly in the 60s on Monday increasing to the 70s and lower 80s by the end of the week.
Discussion
... Issued at 206 PM CDT Sat Sep 19 2026
Surface low remains analyzed over the Central Plains with surface high moving towards Ontario. This continues...