Environment Canada issued a heat‑wave warning for southern Quebec on July 1, 2026, indicating that the humidex could climb to 45. The agency highlighted that a combination of high temperature and humidity would make conditions feel extremely hot across the region.
The humidex, a measure that blends temperature and moisture to describe perceived heat, reaches 45 when both elements are intense. Such a reading is classified as severe and can increase the risk of heat‑related illnesses, especially for vulnerable populations.
The warning applies to the entire southern portion of the province, where the forecast calls for sustained high temperatures accompanied by elevated humidity levels. Environment Canada emphasized that the projected humidex of 45 reflects the most intense portion of the heat wave expected on that day.
Officials noted that the forecasted humidex of 45 aligns with the agency’s criteria for issuing heat‑wave alerts, which are intended to inform the public and local authorities about potentially hazardous weather. Residents of affected communities are urged to stay informed as the situation develops.
On the humidex scale, values around 30 are described as uncomfortable, while readings that exceed 40 are classified as dangerous and can lead to heat exhaustion or heat stroke if precautions are not taken.
The heat‑wave alert issued by Environment Canada is part of its ongoing effort to monitor extreme weather events and to provide timely information when conditions threaten public health.
The forecast suggests that the peak humidex of 45 could be reached during the afternoon hours, when both temperature and moisture levels are typically at their highest.
Prolonged periods of a humidex near 45 can increase electricity demand as air‑conditioning units operate continuously, potentially stressing the power grid.