"All the farmers are walking around with smiles on their faces," show president Mark Reid said.
Although the rain kept crowd numbers down and also reduced the number of entries, it was good news for rural people, he said.
"We won't turn down the rain. We really needed it, whenever it decided to arrive."
Mr Reid said FEI equestrian events were cancelled because of ground conditions but that was the only alteration to the programme as a result of the rain.
Some extra exhibits and new entertainment this year proved popular.
A crossbred sheep owned by Greg Paterson that had "missed the shearing" for about five years, was blade-shorn and show-goers guessed how heavy the fleece was.
It weighed 16.1kg.
A sawmilling demonstration was another crowd-pleaser and the pet parade and children's "Big-Dig" for prizes buried in sawdust were also very popular.
The special guest at the 66th show was Shrek the sheep and his owner, John Perriam, said all farmers would be celebrating the rain.
Shrek had "retired" three months ago but had been a bit restless since moving out of the limelight, he said.