Why are my Broccoli plants dying?

Just planted 2 rows of broccoli plants in my small garden around 6 of them. They seem to be drooping, and hanging down low. It worries me. Should i cover them with shade more? Its really humid sunny , and hot out. It is just starting to rain though. Should i shade them or what? The peppers, tomatoes, and sweet corn are doing just fine so far.