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Grant Park Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C |
| POP: 20% | POP: 40% | POP: 50% | POP: 40% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 500 AM EDT Thu Aug 20 2026 
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Grant Park Forecast Discussion
Issued: 646 AM EDT Thu Aug 20 2026
Key Messages
- A few storms on Thursday and Friday could be strong to severe capable of producing gusty to damaging winds, frequent lightning, and locally heavy rainfall.
- Warm and humid conditions return on Thursday and Friday, with heat index values climbing back into the triple digits each afternoon.
Aviation
... (12Z TAFS) Issued at 640 AM EDT Thu Aug 20 2026
Higher cigs are impacting metro TAF sites this morning ahead of rain and storms over TN. These aren`t expected ...