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Rock Run Park, IL Weather Forecast
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Rock Run Park Weather Forecast
| REST OF TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  | |  | | |  |  | | | | |
| Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C |
| POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 916 AM CDT Sun Aug 23 2026 
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Rock Run Park Forecast Discussion
Issued: 631 AM CDT Sun Aug 23 2026
Key Messages
- Dangerous swimming conditions at unprotected beaches in Cook County and northwest Indiana today.
- Next chance for showers and thunderstorms towards midweek.
Discussion
... Issued at 219 AM CDT Sun Aug 23 2026
The broad upper troughing over the Great Lakes continues to shift east into the northeast CONUS this morning which is allowing a surface high to build into the region from the Upper Midwest. This surface high is expected to remain over the area through Tuesday which will result in r...