updated
Storms arrive ahead of the end of Waterloo Region heat wave
Posted Jul 3, 2026 03:53:09 AM.
Last Updated Jul 3, 2026 07:28:12 AM.
After almost a full week of sweltering temperatures and humidity, a heat wave blanketing the Region of Waterloo is about to come to an end.
Environment Canada still has an orange-level heat warning in effect for us for Friday, also for much of southern Ontario.
At 6:43 a.m. Friday, the weather agency also issued a yellow-level severe thunderstorm watch for the region, calling for the potential of high winds and hail.
An intense thunderstorm hit the region less than half an hour later, with dark clouds, rain, thunder and lightning.
Friday’s high will be 28 degrees, and combined with the humidity, it will feel like 36.
But the overnight low is finally expected to fall below 20 degrees Friday night into Saturday for the first time since that heat warning began Monday afternoon.
The Saturday and Sunday highs will be in the mid-20’s, with overnight lows around 17 for the weekend and to start next week.
While the heat warning is still in effect though, the weather agency reminds everyone to stay safe in this weather.
They recommend drinking water often before you feel thirsty.
And to watch out for the early signs of heat exhaustion, including headache, nausea, dizziness, thirst, dark urine, and intense fatigue.
Environment Canada also points out that heat stroke can include red and hot skin, dizziness, nausea, confusion, and change in consciousness.
And to never leave people, especially children, or pets inside a parked vehicle.
The weather agency issues a heat warning when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses.
Related stories
