Summer temperature days 17c to33c
nights 12c to 25c
Spring and Fall days 5c to 20c nights 0c to
15c
Winter days -15c to +5c nights -24 to +1
Some summer thunderstorms can be intense, you should seek cover. These storms always give some warning. Most days are just beautiful, with lots of sun and puffy white clouds, rains happen about 10% of the time. There has been no tornadoes in this area for over 70 years, but do happen 100 km north or west every few years. See the current weather here: Environment Canada's Toronto Weather.