Do you mean "In the Rain" by E.E. Cummings?
in the rain-
darkness, the sunset
being sheathed i sit and
think of you
the holy
city which is your face
your little cheeks the streets
of...
It might be called "She enters through a dense electric twilight" ... most of his poems are untitled, and so they are known by their first lines. I think that is the first line of this one about...