Police said the stabbing was reported at around 10:50 p.m.
Officers found a 23-year-old man with a stab wound, police said.
He was taken to hospital by paramedics with serious but non-life-threatening injuries.
The stabbing comes as the city’s Woodbine Beach area saw a rash of violence on Sunday.
Police said 19 people were arrested that night, including several minors, for incidents that involved a shooting, stabbing, two gunpoint robberies, and fireworks shot at officers.
One officer suffered a broken leg and others suffered serious injuries such as burns, police said.
Due to Sunday’s events, police said there would be an increase in officer presence for Monday night at Ashbridges Bay and Woodbine Beach.
Toronto police said five people were arrested Monday night. Three were arrested for allegedly setting off fireworks, including a 19-year-old who police said aimed fireworks into a crowd.
Another two arrests were made after police said two people made threats on a bus using a replica firearm. One of those arrested was released without charge, police said.
“The event was largely peaceful and officers want to thank the vast majority of the public who celebrated the day safely and responsibily (sic),” Toronto police said in a press release.Police released details of two teenagers who were charged Monday night.
Harristen Kumaraguru, a 19-year-old from Toronto, faces three charges, including carrying a concealed weapon. Quame Marcus Manahan, 18, was charged with common nuisance.
There were no injuries to officers that night.
— With files from Global News’ Isaac Callan