What little guy? You talk about yourself and then I guess you are talking about your son? If you are going to work out, stay hydrated as I can tell you already are, and when you get back take a cool shower and bring your temperature down. Your body works hard to stay cool and you can use a cool shower to take the burden off the internal mechanisms.
If you are talking about your son, be very careful. Children can dehydrate very quickly and they are less likely to stop activity if they begin to feel tired. They are less in tune with danger signs.
I live in FL and have lived in “more than Florida hot” Memphis, and I always walked in the morning without trouble. But, I was just walking, some small hills, it probably was in the 80’s when I actually took the walk, and the walk lasted around 40 minutes. I did come home to air conditioning. I’ve walked through Disney in 95 degree heat where you get small breaks in the shade and on rides. The heat definitely can wipe you out. Just 45 minutes in the 90’s by the sitting in the sun can make me want to nap for an hour and a half. I usually don’t notice it right away, but it catches up with me within a few hours.
You should not go far from your home if you will be exercising alone (remember you need to make it back home and it will be getting hotter as the hour gets later). Wear your name and the telephone number of a contact who knows you (you should always do this, especially when exercising alone).
Choose alternate exercises during intense heat like mall walking or swimming.
Consider getting a portable air conditioner.