which is the correct sentence "wind was blowing in his face" or "wind was blowing on his face"? Should be use 'in', 'on' or 'at' or 'toward' after 'the wind' ?
"Wind was blowing in his face" is very common
"Wind was blowing on his face" sounds kind of awkward in this context.
"Wind was blowing at his face" sounds like the wind is blowing in the general direction of his face, but not directly in his face. The first one evokes the imagery of the hair flying back.
"Wind was blowing toward his face" sounds much like "at", in that it is much less image-evoking than the first.
As gotube said, both can be correct. "On his face" sounds quite odd, but it doesn't sound grammatically wrong, it just probably doesn't mean what you think it does,