I have vacationed there, as well as Cuba and Mexico. It's quite warm, but far off from temperatures that will kill humans.
At 35 degrees celsius and 100% humidity with no way to cool down, you are already on borrowed time. It's just a matter of time before organ failure and brain damage set in depending on length of exposure. At 45 degrees Celsius with 100% humidity under the same conditions, even the fittest of humans is in deep, deep shit.
Life does thrive in heat, but there certainly are limits.