Canada Heat Indexes up to +51°C, One of the Worst Feel-like in Canadian history! Quebec Tmin +27,0°C
Marek Kučera 
🔥Historic Heatwave Grips Eastern Canada: Records Obliterated, Warmest Nights Ever Recorded
Eastern Canada is experiencing one of the most extreme and relentless heatwaves in its meteorological history, with hundreds of high-temperature records shattered, including all-time warmest June nights and heat index values reaching life-threatening levels. From Ontario to Nova Scotia, the region has endured record-breaking maximums, suffocating humidity, and historic overnight heat, making this a truly unprecedented event.
🌡️Daytime Temperatures Near All-Time Highs
Several cities across Quebec, New Brunswick, and Nova Scotia have recorded their hottest June days ever, with some values just decimals away from all-time monthly records:
- 36.6°C in Gatineau, Quebec
- 36.4°C in L’Assomption, Quebec
- 36.0°C in St. Stephen, New Brunswick
- 35.8°C in Saint-Hubert, Quebec
- 35.5°C in St-Hubert, Quebec (new June record)
- 35.2°C in St-Anicet, Quebec
- 35.1°C in Trois-Rivières, Quebec
- 34.4°C in Kejimkujik Park, Nova Scotia
- 34.0°C in Nicolet, Quebec
Many of these temperatures were only 0.2°C to 0.5°C below all-time national monthly highs, showing the severity of this heat event.
🥵Heat Indexes Reached 47–51°C (117–124°F)
The humidity has pushed humidex readings to 51°C in some areas, including parts of Quebec and New Brunswick—among the highest “feels-like” temperatures ever recorded in Canadian history. The oppressive combination of heat and moisture has created extremely dangerous outdoor conditions, especially for vulnerable populations.
🌃Historic Warm Nights: Canada’s Warmest on Record
Perhaps even more shocking is the incredible warmth overnight, with minimum temperatures shattering records across Quebec and Ontario:
- 27.0°C (81°F) in St-Clothilde, Quebec – likely the warmest June night ever recorded in Canada
- 25.5°C (78°F) minimums in Ontario, including Toronto Pearson Airport, where the high minimum tied or came close to the all-time record for any month
- Many locations in Quebec, including L’Acadie, Egbert, and St-Anicet, also set June warm night records
Meteorologists describe the overnight temperatures as “absolutely unprecedented”, with many records smashed by wide margins, and next nights may be even hotter.
📈Widespread Record Destruction Across Provinces
This extreme heatwave has led to hundreds of daily and monthly records being broken across the eastern provinces, especially in:
- Quebec
- New Brunswick
- Ontario
- Nova Scotia
Some locations experienced both record highs and record minimums on the same day, highlighting the round-the-clock intensity of this heat event.
⚠️Health Risk and Climate Warning
With humidex values in the 45–51°C range, health authorities have issued extreme heat warnings. The lack of nighttime cooling increases the risk of heat exhaustion, dehydration, and even heatstroke, particularly in homes without air conditioning.
This event is now being classified by experts as one of the worst heatwaves in Eastern Canadian history—a clear signal of changing climate patterns and the increasing frequency of extreme weather events in northern latitudes.
🔥In Summary:
- 36.6°C Gatineau, 36.4°C L’Assomption, 36.0°C St. Stephen: New June records
- 27.0°C minimum in St-Clothilde: warmest June night ever recorded in Quebec
- Heat index up to 51°C: among Canada’s highest feel-like values ever
- Hundreds of June records broken, including all-time high minimums
- Historic, dangerous humid heat affecting millions across Eastern Canada
As the heatwave continues, authorities are urging people to stay hydrated, limit outdoor exposure, and check on vulnerable individuals. The next few nights could bring even higher overnight temperatures, continuing this unprecedented heat crisis.
Illustration picture: https://www.backroads.com/award-winning-tours/quebec
