That heat has been a dangerous factor for those trying to enter the country illegally.
With only eight days into August, US Border Patrol Agents have rescued 15 illegal immigrants, and found the remains of four others in the Rio Grande Valley. They appeared to have died from dehydration or heat exposure.
Officials say this year the number of rescues is up 60% from last year, and the number of deaths is up a staggering 140%.
If you see suspicious activity, call Border Patrol at 800-863-9382.