This is an old article, but the flow of visitors certainly seemed to continue through the whole summer.
From the Niagara Falls Review:
Niagara’s two casinos are cashing in thanks to a weaker Canadian dollar and more Americans crossing the border.
“Business was solid April through June,” said Greg Medulun, director of communications for Fallsview Casino Resort. “The casinos have experienced favourable conditions including a weaker loony that has translated into a spike in business.”
In addition, he adds, fewer Canadians have been crossing the border, while more Americans have been coming our way.