Lincoln, ON – (June 21, 2025) – Environment Canada has issued a Heat Warning for Niagara Region. The first significant heat event of the season with dangerously hot and humid conditions will begin Sunday afternoon and is expected to continue through to Tuesday, June 24, 2025.
- Daytime highs of 31 to 36 degrees Celsius.
- Humidex values of 40 to 45.
- Overnight lows of 21 to 25 degrees Celsius, providing little relief from the heat.
Please note:
- The extreme heat and humidity may continue into Wednesday. A cold front is expected to push through the region late Tuesday but there is some uncertainty with how far south this front will get.
- Areas near the lakes could be slightly cooler than regions further inland. As of June 21, Charles Daley Park is noted as safe for swimming according to Niagara Region's Beach Water Testing Results.
- Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category.
- The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
- Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
- Drink plenty of water even before you feel thirsty and stay in a cool place.
- Never leave people or pets inside a parked vehicle.
- Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.
Cooling Spaces:
Anyone seeking relief from the extreme heat is welcome at Town facilities and outdoor spaces during heat alerts. Please visit our Cooling Spaces/Extreme Heat webpage to learn more about our cooling spaces.
Our pools offer FREE leisure swims when a High Heat Alert has been activated. Visit our Public Swimming webpage to learn more. (Please note only Allan F. Gretsinger Pool is currently open; Jordan Lions Pool opens on June 28.
For additional social services and community programs available in the Niagara Region, please call 2-1-1.