The WBC 30 day weigh in is to make sure the fighters are safely heading towards the limit, rather than trying to crash the limit in the final weeks of training, and both fighters have to be within 10% of the divisional maximum. So in this case the 160lb division has a maximum check weight of 176lbs.
For the check weight Golovkin easily made the limit, in fact at 165lbs he was well inside the maximum allowed for the Light Middleweight limit. The weight for Golovkin seemed to prove that he was indeed a small Middleweight and amazing he was only 3.3lbs above the Maximum allowed or a Welterweight!
Lemieux on the other hand was much closer to the limit, weighing in at 175.4lbs, just over 0.5lbs inside the Maximum allowed.
These numbers seem to suggest that not only is Golovkin a small Middleweight but that Lemieux is going to have a notable advantage when the two men get in the ring on October 17th.