Heat Wave Sends Montreal Humidex to 44, Quebec City to 42

A heat wave that has swept across Quebec, Ontario and the Maritimes pushed the humidex to 44 in Montreal and 42 in Quebec City on the afternoon of Wednesday, July 1, 2026. The measurements were recorded as the high‑temperature system continued its eastward progression, affecting major urban centres and surrounding communities.

The humidex, a Canadian index that combines temperature and humidity to reflect perceived heat, reached its peak in Montreal at 44, while Quebec City recorded a reading of 42. Both values indicate conditions that are significantly uncomfortable and can pose health risks, especially for vulnerable populations.

Meteorological observations show that the current heat wave is part of a prolonged period of elevated temperatures that began earlier in the summer of 2026. The pattern has persisted despite typical mid‑summer cooling trends, maintaining higher than average temperatures across the region for several weeks.

Officials in both cities have been monitoring the situation closely. Public health advisories issued earlier in the week warned residents to stay hydrated, limit outdoor activity during the hottest parts of the day, and seek cooler environments when possible. Emergency services reported an increase in calls related to heat‑related discomfort, although no severe incidents were documented at the time of reporting.

The broader weather system responsible for the heat wave also continues to affect Ontario, where several municipalities reported humidex values approaching the low 40s, and the Maritimes, where temperatures remain elevated though humidity levels are lower. Forecast models suggest that the high‑pressure ridge driving the heat may linger for several more days before a cooler front moves in.

Residents are advised to remain aware of the ongoing conditions, follow any updates from local authorities, and take precautionary measures to mitigate the impact of the heat. The situation underscores the challenges posed by sustained high temperatures during the summer months in eastern Canada.