Forgive me, Mother Nature, I'm not at all impressed with your behavior of late. Your rain clouds promise relief from the heat, and yet, they failed to deliver when and where it is most needed.
Before the 18th of August, this field received less than 2 inches of rainfall since it was planted in early June. Note the curled, upright leaves that indicates the plant is in exteme stress due to lack of moisture. An inch of rain a week earlier would have made an entirely different picture.