Check the forecast on the
Weather Network or the
WeatherCAN app from
Environment Canada for current conditions and alerts.
Access additional heat and health resources, including community supports, information for residents and professionals, City reports and documents related to hot weather and historical heat warning dates.
Environment and Climate Change Canada has introduced colour-coded weather alerts to help communicate the level of weather-related risk associated with warnings, watches and advisories. Learn more about the new weather alert system.
Resources for Health Professionals
City Heat Response Reports & Documents
Previous Heat Warning Dates
As of 2019, Toronto Public Health no longer issues heat warnings to the public, as they are communicated broadly by Environment and Climate Change Canada. Learn more about Toronto’s Heat Relief Strategy.
2026 Heat Warnings
2025 Heat Warnings
- June: 21-25
- July: 4-6, 11-17, 23-30
- August: 8-13
2024 Heat Warnings
- June: 16-21
- July: 7-9, 12-16, 31
- August: 1
2023 Heat Warnings
- May: 31
- June: 1-2
- July: 3-6, 25-29
- September: 2-6
2022 Heat Warnings
- May: 31
- June: 20-22, 24-27
- July: 18-24
- August: 5-8
2021 Heat Warnings
- June: 4-8, 29
- July: 4-6
- August: 10-12, 19 & 20
2020 Heat Warnings
- May: 26 & 27
- June: 9 & 10, 20-22
- July: 2-10, 17-19, 25-27
- August: 9 &10, 23 & 24
2019 Heat Warnings
- July: 5 & 6, 18-21, 26-30
Previous Heat Warnings
Data is available on the number of Heat Warnings from 2001 to 2018.
Date modified: May 29, 2026
