McGinn took his tally to 11 for the season with a pair of goals in the second half as the Dons defied incessant horizontal rain to end a three-match winless run and climb to fourth, above Saints, who are without a win in four.
"The conditions were farcical," Lomas said.
"I don't want it to sound like sour grapes but that wasn't a game of football.
"The wind spoiled it as a spectacle and I feel sorry for any fan that had to pay. I didn't enjoy one minute of it.
"I don't know about summer football but there have to be measures taken."
Lomas conceded Aberdeen were deserving winners and praised his goalkeeper Alan Mannus, who prevented the hosts from scoring more with a string of stops.
The Saints boss added: "All credit to Aberdeen second half. They deserved to win.
"Alan was brilliant, it could've been a lot worse. He pulled off four or five great saves."