When Is Canadian SummerIn that narrow window, the country transforms. Patios fill. Lakes warm enough to swim in. Every weekend is a festival somewhere—strawberries, fiddles, dragon boats, powwows. People drive north on Friday afternoons and return Sunday night with sunburned shoulders and tired smiles. Cottage country gridlocks. Ice cream shops run out of sprinkles. Most Canadians do not live by the astronomical calendar. Culturally, summer is the warmest time of the year, typically spanning . when is canadian summer | City | Typical Start of "Warm" Weather | Hottest Month | Typical Max Temp (Day) | | :--- | :--- | :--- | :--- | | | Early July | August | 22°C (72°F) | | Calgary | Late June | July | 23°C (73°F) | | Toronto | Late May/Early June | July | 27°C (81°F) | | Montreal | Early June | July | 26°C (79°F) | | Halifax | Early July | July/August | 23°C (73°F) | In that narrow window, the country transforms |