Many short black hair styles for weddings are being used for summertime wedding dates. The woman who is choosing this style has probably thought of the hot sun and wants to keep her hair in check or out of her face. This is a special day and she may not want to take a chance of ruining it because the hairstyle failed.
You also have to think of the hundreds of pictures that will be taken. When the event starts you will not have time to whip out a mirror to check your look. Once the flashing lights of the cameras start going off you are stuck with what you have for that moment.