Highs today will flirt with 100f and heat indexes will top out around 107f. It's not record heat but it is dangerous especially for the elderly and small children. Believe it or not, you can sweat out a gallon of water in an hour if you are working outside in this heat. Drink water, lots of it.
Tuesday and Wednesday may see heat index values top 110f... the hottest of the year. There is a chance for a thunderstorm each afternoon. Double check that back seat before you leave the car!!!