OttawaEnvironment Canada has a heat warning for eastern Ontario as temperatures are expected to linger in the low-to-mid 30s until at least Tuesday.Daytime highs will be in the low-to-mid 30s until at least TuesdayCBC News · Posted: Aug 08, 2025 3:42 PM EDT | Last Updated: 1 hour agoA file photo from 2024 of a person carrying an umbrella for shade as they walk on Parliament Hill. On Friday, Environment Canada issued its fourth heat warning this year for the nation’s capital. (The Canadian Pres/Sean Kilpatrick)UPDATE: Environment Canada said Sunday that people in the region should expect highs between 32 and 35 C early this week. A colder air mass is slated to arrive Tuesday night, but eastern Ontario could still see hot and humid conditions on Wednesday, the weather agency said.Environment Canada has issued another heat warning for eastern Ontario as temperatures are expected to rise to the low 30s this weekend.The weather agency said the heat wave will begin Saturday with daytime highs between 30 and 33 C, potentially feeling as hot as 40 C with humidity.There’ll be no break from the heat after sunset either, as overnight lows range from 19 to 23 C.The heat wave is expected to end with cooler temperatures midway through next week.This is the fourth heat warning Environment Canada has issued for Ottawa this summer, with the most recent one coming two weeks ago when temperatures were in the low-to-mid 30s in Ottawa-Gatineau.Heat can affect everyoneEnvironment Canada warns that extreme heat can affect everyone’s health and encourages anyone suffering from heat exhaustion to stop physical activities and drink water.Red and hot skin, dizziness, nausea, confusion and change in consciousness are possible signs of heat stroke, according to the agency.Health Canada recommends staying cool and staying hydrated when extreme heat hits.That can mean everything from drinking lots of water and rescheduling outdoor activities for cooler times to preparing meals that don’t require ovens and keeping track of nearby air-conditioned spaces.Anyone who feels they have heat stroke should call 911.More resources may be available through your municipality. Ottawa, for example, has a map of public and other places to cool off.
Extreme heat across eastern Ontario to continue this week
