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St. Johns Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Showers Likely | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Partly Cloudy |
| Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C |
| POP: 100% | POP: 40% | POP: 70% | POP: 80% | POP: 70% | POP: 60% | POP: 40% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 647 AM EDT Thu Sep 17 2026 
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Issued: 653 AM EDT Thu Sep 17 2026
Key Messages
1) Showers and storms with locally heavy rainfall possible into early afternoon.
2) Another hot day today with temperatures easing a bit thereafter, although still remaining above normal until midweek when more seasonable air will settle in.
3) More showers and storms possible late tonight and again over the weekend as a cold front pushes into the area.
Discussion
... KEY MESSAGE 1) Showers and storms have developed overnight along an east-west front that is across northern Indiana into ...