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O'Brien Field, IL Weather Forecast
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O'Brien Field Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY |
 |  | |  |  |  |  | |  | | |
| Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Showers | Mostly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C |
| POP: 40% | POP: 40% | POP: 60% | POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 522 AM CDT Sat Sep 19 2026 
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Issued: 554 AM CDT Sat Sep 19 2026
Key Messages
- A Marginal Risk (level 1 of 5) for severe weather exists across parts of central Illinois both today and Sunday. The primary hazard will be isolated strong wind gusts.
- Much cooler conditions will be on tap next week as high temperatures dip into the 60s everywhere north of the I-70 corridor Monday and Tuesday.
Discussion
... Issued at 348 AM CDT Sat Sep 19 2026
08z/2am radar imagery shows a large cluster of convection along the Illinois/Wisconsin border. The storms are occurring ahead o...