Lethbridge remains under a Yellow Heat Warning as of Tuesday, July 28, 2026, with daytime highs expected to hover between 30 and 34 degrees Celsius through the week. Environment Canada says the warning, first issued on July 22, has been extended as above-seasonal heat grips southern Alberta.
Forecasts show Tuesday reaching 33°C and Wednesday 32°C, with Thursday and Friday climbing to 32°C and 34°C respectively. Saturday’s high is forecast at 34°C, roughly eight degrees above the seasonal normal of 26°C. A slight cooldown is expected Sunday with a high of 27°C.
Adding to the discomfort, wildfire smoke from British Columbia and Washington State is expected to reduce air quality and visibility on Tuesday and Wednesday afternoons. The Air Quality Health Index is forecast to reach 6, or moderate risk, by Wednesday morning. On July 23, the index hit 7, or high risk, as thick smoke blanketed the region.
Environment Canada and Alberta Health Services are reminding residents to stay hydrated and avoid strenuous outdoor activities during peak afternoon heat. People are urged never to leave children or pets inside parked vehicles. Those most vulnerable to heat illness include infants, children, seniors, people with pre-existing health conditions, outdoor workers, and anyone who is socially isolated.
The City of Lethbridge has activated its heat response. Cooling spaces are available at public libraries and recreation centres. Spray parks at Legacy Regional Park, Gyro Spray Park behind Nicholas Sheran Leisure Centre, and the Rotary Centennial Fountain at Galt Gardens are open. Public water stations are set up in Nicholas Sheran Park, Legacy Park, Henderson Lake Park, and Galt Gardens downtown. Local outreach groups such as Streets Alive Mission are also distributing water to those in need.
