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Siper Diffenbaugh Park, IL Weather Forecast
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Siper Diffenbaugh Park Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  |  | | |  | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Sunny | Clear | Sunny | Mostly Clear | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 71°FLo: 22°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C |
| POP: 50% | POP: 90% | POP: 30% | POP: 50% | POP: 40% | POP: 40% | POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 331 PM CDT Tue Sep 08 2026 
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Issued: 246 PM CDT Tue Sep 8 2026
Key Messages
- A storm system passing through the Upper Midwest will bring widespread showers and storms to the area tonight into Wednesday morning. Severe storms and heavy rainfall with the potential for some localized flash flooding will be possible in eastern Iowa.
- Quiet cooler weather Thursday into Friday, as high pressure passes overhead.
- Another stretch of potentially active weather this weekend into the next work week, bringing daily chances of precipitation for some.
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