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Harnew Park, IL Weather Forecast
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Harnew Park Weather Forecast
| LATE THIS AFTERNOON | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Clearing | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy |
| Hi: 79°FHi: 26°C | Lo: 75°FLo: 24°C | Hi: 89°FHi: 32°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 75°FLo: 24°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 71°FLo: 22°C |
| POP: 60% | POP: 50% | POP: 20% | POP: 20% | POP: 20% | POP: 40% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 246 PM CDT Sun Aug 30 2026 
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Issued: 231 PM CDT Sun Aug 30 2026
Key Messages
- Periodic shower and storms through the early part of the week, though there will ample dry periods.
- Hotter and more humid conditions build through midweek.
Discussion
... Issued at 231 PM CDT Sun Aug 30 2026
A shortwave disturbance over northeastern Iowa will continue to drive showers and embedded thunderstorms eastward through early this evening, with the greatest coverage expected north of I-80. While a 20% chance for lightning remains, poor mid-level lapse rates across northern Illin...