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City of Joliet, IllinoisJoliet, IL Weather Forecast
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Joliet Weather Forecast
| LATE THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Mostly Cloudy | Partly Cloudy | Chance of Showers | Clearing | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers | Showers Likely | Showers | Chance of Showers |
| Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 40% | POP: 20% | POP: 50% | POP: 80% | POP: 70% | POP: 60% | POP: 60% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 321 PM CDT Sat Sep 12 2026 
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Issued: 130 PM CDT Sat Sep 12 2026
Key Messages
- Turning cooler tomorrow with a chance for afternoon showers.
- Waves of heavy rain producing thunderstorms possible in the general region early to mid next week.
Discussion
... Issued at 130 PM CDT Sat Sep 12 2026
A cold front is pushing into northwest Illinois early this afternoon and will continue to shift across the forecast area through this evening. While dewpoints have been slowly climbing into the upper 60s/near 70 degrees ahead of this boundary, forecast soundings remain generally...