Springtime in Toronto can start off cool in March, working its way up to warmer temperatures in May, with averages of around 15°C. Summer (June-August) is the time when the city comes alive, with people spilling out into the streets and enjoying high temperatures of around 25°C. Fall is also an attractive time to visit, with averages in September remaining warm, around 18°C. The winter months of December - February can see temperatures dip as low as -5°C.