Tate, who will meet Amanda Nunes (12-4), made it to the weigh-in site with only seconds to spare at 10am and was 134.5 pounds, while Nunes was 135 (61kg).
American news outlet MMAjunkie reported that had Tate not hit the scales in time, the fight could have been pulled from the card. Had Tate missed weight, the fight would have been a non-title bout, MMAjunkie reported.
But, after the drama of Jon Jones (22-1) being removed from his light heavyweight title unification bout with Daniel Cormier (17-1) due to a suspected failed drugs test this week, Tate and Nunes will go ahead as planned as the replacement main event.
Cormier will now meet Anderson Silva (33-7, 1 NC) in a non-title, light heavyweight match-up and Silva weighed-in at 198.5 pounds, well below the 205-pound (93kg) light heavyweight limit. Cormier was 206 pounds.
Across the whole fight card, only one fighter missed weight and that was welterweight Johny Hendricks (17-4) who tipped in at 171.25 pounds - only 113 grams over - but it still means he will forfeit 25% of his purse to opponent Kelvin Gastelum (11-2) who was 171 pounds.
Log on to nzherald.co.nz from 2pm tomorrow to follow Daniel Richardson's live blog of UFC 200