Late in the evening bar staff also stopped serving Clabby alcohol, serving him non-alcoholic drinks only, Scott wrote in his findings.
Although he did not appear intoxicated on CCTV footage when leaving the bar, a post-mortem test showed he had a blood alcohol level of 301mg, six times the driving limit.
He believed Clabby was "significantly affected by alcohol", but not "grossly intoxicated or drunk".
"He was able to function, at least on a superficial level, reasonably normally."
After leaving the bar at 1.30am, Clabby was not seen alive again.
It was not known why he went to the harbour, but a friend said he sometimes went there to see if a waterfront bar was open.
Scott did not believe Clabby - who a friend said could not swim - jumped into the harbour voluntarily, and police had ruled out his being pushed.
He agreed with police that Clabby fell or stumbled into the harbour, Scott said.
A post-mortem found Clabby drowned, but there was also evidence of a heart condition and alcohol effect, as well as multiple minor skin injuries on the head, neck and elsewhere.
The pathologist agreed with him that Clabby had fallen into the harbour due to tripping of stumbling while affected by alcohol, or because of a medical event related to his heart condition.
Concerns raised with the coroner about lighting at the site where Clabby is believed to have entered the water were not likely to be a factor, but Scott asked Wellington City Council to review lighting in the area.
A review had been done and limited changes made, Scott said.