Organisers say despite the rain, 75,000 people took advantage of the event which started 23 years ago.
That compares to the 66,000 who took part last year. This year visitors got the chance to tour 100 buildings, choose from 41 walks and enjoy 15 talks and events in the built heritage festival.
Highlights included the fully booked tours of Wellpark Brewery, the Clyde Tunnel control room, the small animal hospital at Glasgow University and the People's Dispensary for Sick Animals.
The owners of three homes in Rawcliffe House, which was a former Carmelite Monastery, opened up their properties and gave visitors guided tours.
Visitors accessed the bell tower in St Mary's Cathedral while Hyndland Secondary School, celebrating its centenary, recorded visitor numbers four times higher than last year.
Doors Open Day is organised by Glasgow Building Preservation Trust and events and development co-ordinator Ruth Morris, said: "Doors Open Day has given Glaswegians a chance to explore their own city and they have really taken advantage of this as the increased visitor numbers prove."
GBPT chairman John Entwistle said: "The day provides a chance for all to get involved in their local community and learn something about their history, culture and surroundings.."