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Jaycee Park Grayslake, IL Weather Forecast
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Jaycee Park Grayslake Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
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| Clearing | Sunny | 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 |
| Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C |
| POP: 70% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 741 PM CDT Wed Aug 19 2026 
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Jaycee Park Grayslake Forecast Discussion
Issued: 602 PM CDT Wed Aug 19 2026
Key Messages
- Scattered thunderstorms are possible this evening south of I-80, greatest coverage likely south of the Kankakee and Illinois Rivers.
- Storms this evening will be capable of locally torrential downpours which could result in localized flash flood threat. In addition, isolated severe storms capable of large hail and damaging winds are possible too.
Discussion
... Issued at 233 PM CDT Wed Aug 19 2026
Through Tonight...
Showers and thunderstorms should tend to gr...