Answer:
I have a tongue, but do not talk. I follow close, but neither run nor walk. Coupled and hitched, but never married. You couldn't bear the load I've carried.
I have a face, yet no senses. But I don't really care, because time is of the essence.
They made me a mouth, but didn't give me breath. Water gives me life, but the sun brings me death.
My thunder comes before the lightning. My lightning comes before the clouds. My rain dries all the land it touches.
It's in your hand though you can not feel it. Only you and time can reveal it.
It weighs next to nothing but no one can hold it for long. What is it?