On July 1, the humidex—a combined index of temperature and humidity—climbed to 44 in Montreal, while Quebec City recorded a reading of 42. The readings came as a lingering heat wave continued to sweep across the province, pushing comfort levels to extreme levels in both cities.
The elevated humidex values are part of a broader pattern affecting much of eastern Canada. Meteorological data show that the same high‑temperature, high‑humidity conditions have been present across Quebec, Ontario and the Maritime provinces for several days, creating a region‑wide surge in perceived heat.
Experts note that a humidex of 44 signals conditions that can be dangerous for vulnerable populations, especially those engaged in outdoor activity or without access to cooling. The index reflects not only the air temperature but also the moisture content, meaning that even moderate temperatures can feel oppressive when humidity is high.
Authorities in both Montreal and Quebec City have issued advisories urging residents to stay hydrated, limit strenuous activity during peak heat hours, and seek cooler environments when possible. The ongoing heat wave is expected to persist through the early part of the week, maintaining humidex levels well above typical summer averages for the region.
The situation underscores the impact of sustained high‑temperature events on daily life across eastern Canada, as communities adapt to the challenges posed by an unusually hot and humid summer season.