Occupancy in the city averaged 88.5% in September - the best figure since records began in 1999.
Tourism researchers LJ Forecaster found occupancy at more than 90% on 16 nights of the month.
It followed a strong August, when average occupancy in the city exceeded 90% for the first time.
The report also shows Glasgow's average occupancy between April and September was 84.1% - up 2.6% on the same spell last year.
Glasgow City Marketing Bureau said key events behind the boom included the BBC Proms at Glasgow Green, Scotland's World Cup qualifying match against Belgium, Rod Stewart's gigs at the new Hydro venue, the Liberal Democrats' party conference and the annual meeting of the European Society of Regional Anaesthesia.