USUALLY, at 100-years-old, thing start slowing down.

But that's not the case for the Gatton Show Society.

Despite the drizzly conditions show-goers were flocking through the gates for the 100th annual Gatton Show.

Having been at the forefront of the show society for the past 10 years, show society president Keith Edwards said he was extremely happy with the show, despite the weather.

"We've had an amazing day, the show ring was full, we had the opening at midday with the governor general and the stalls inside were full with great coverage," Mr Edwards said.

"The rain hasn't kept too many people away … the Lockyer people love the rain."

The uninvited wet weather caused a few changes to the evening program with the Kaos stunt riders unable to perform, along with the Globe of Death lads.

But they still put on a spectacular for the crowd, racing around the main arena.

The horses continued to shine in the arena, with Millmerran rider Robert Moffatt on Viduka claiming honours in the Boral Grand Prix 1.50m class, narrowly defeating Glamorgan Vale riders Stuart and Becky Jenkins.

Queensland Governor Paul De Jersey opened the show prior to the grand parade along.

Queensland Chamber of Agricultural Shows president Estelle Drynam awarding the show with a plaque to commemorate the milestone achieving.

Mr Edwards said it was a great show.

"I'm just so pleased to be part of this years 100th show," he said.