Weather in Thunder Bay

yellow warning - heat - in effect

Areas: Atikokan - Shebandowan - Quetico Park

28/07/2026, 22:02:45 → 29/07/2026, 14:02:45

Multi-day heat event beginning Wednesday afternoon. What: Daytime highs of 29 to 31 degrees Celsius. Humidex values of 33 to 38. Nighttime lows of 16 to 19 degrees Celsius, providing little relief from the heat. When: Beginning Wednesday and ending Thursday evening. Additional information: A multi-day heat event is expected to end Thursday evening but may possibly continue into Friday. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category. ### 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. For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm.

yellow warning - heat - in effect

Areas: Atikokan - Shebandowan - Quetico Park

28/07/2026, 22:02:45 → 29/07/2026, 14:02:45

### 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. For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm.

yellow warning - heat - in effect

Areas: Atikokan - Shebandowan - Quetico Park

29/07/2026, 05:27:48 → 29/07/2026, 21:27:48

Multi-day heat event beginning today. What: Daytime highs of 29 to 31 degrees Celsius. Humidex values of 33 to 38. Nighttime lows of 16 to 19 degrees Celsius, providing little relief from the heat. When: Beginning this afternoon and ending Thursday evening. Additional information: A multi-day heat event is expected to end Thursday evening but may possibly continue into Friday. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high-risk category. ### 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. For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm.

yellow warning - heat - in effect

Areas: Atikokan - Shebandowan - Quetico Park

29/07/2026, 05:27:48 → 29/07/2026, 21:27:48

### 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. For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm.