This week's weather forecast in Toronto includes an epic temperature swing that'll have the city shivering and sweating within 72 hours. You've got to love the way Toronto weather keeps you on your toes. This week, it's coming in the form of an epic temperature swing that'll leave Toronto feeling like it jumped nearly 30 degrees within days, The Weather Network predicts. Later that evening, temperatures will dip down to a low of 8 degrees, feeling like 7. Beyond that, the forecast largely predicts temperatures in the mid-twenties for the following week, potentially signalling, at long last, the return of consistent summer weather.