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Willowbrook County Forest Preserve, IL Weather Forecast
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Willowbrook County Forest Preserve Weather Forecast
| EARLY THIS MORNING | TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  | |  | |  | | | |  | |
| Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Chance of T-Storm |
| Hi: 61°FHi: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C |
| POP: 50% | POP: 60% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 311 AM CDT Fri Aug 21 2026 
Willowbrook County Forest Preserve Radar Loop
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Willowbrook County Forest Preserve Weather Map
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Willowbrook County Forest Preserve Forecast Discussion
Issued: 245 AM CDT Fri Aug 21 2026
Key Messages
- Scattered showers and thunderstorms are expected today, mainly during the afternoon and evening hours. A few storms could become severe with damaging winds and hail the main threats, but an isolated tornado cannot be ruled out.
- Dangerous swim conditions are expected at Porter County Lake Michigan beaches Saturday, then all Illinois and Indiana Lake Michigan beaches late Saturday night and Sunday.
Discussion
... Issued at 245 AM CDT Fri Aug 21 2026
A shortwave trough is pivoting across t...