No, it is not always a bad thing. We are overcast at the moment, so it will keep the temps down into the mid-80s, maybe. That would be good, too, as the weeds are now encroaching into the basement and the kudzu is beginning to climb up the bricks. I might actually do some yard work today! Why do the unwanted plants thrive with little water and the wanted plants die quickly?
I think there is a lesson about good and evil in your question.