Summer in Canada is defined by two main frameworks: the (based on Earth’s orbit) and the meteorological summer (based on annual temperature cycles). While the official calendar places summer from late June to late September, the experience of summer weather varies significantly by latitude and geography. In most populated regions, summer conditions are reliably present from June through August , with considerable variation in spring and autumn shoulder months.

Canada’s massive size means summer is not a "one size fits all" experience. Depending on where you travel, you may face humid heat waves or crisp, cool mountain air.

This definition aligns most closely with when Canadians typically experience summer-like temperatures and is used for most agricultural, tourism, and energy demand forecasting.