HRRR already has ORD at 97 by 18z Tuesday, so 100 may very well be within reach. No idea why LOT is only forecasting a high of 94 though, seems way too low. I'd be absolutely baffled if temps don't get higher than the early July heatwave around these parts with warmer thermals and lower DPs, likely resulting in more efficient mixing.

Seconded

When I first read your post I thought it said “My son showed up with 2 of his fiancées”

My son showed up at 2 with his finacee and 5 of her friends and said they are taking the boat and we are coming. Gorgeous out here... air temp of 76 and water temp of 74 and no wind. Everyone is swimming. Summer perfection.