Weather in Thunder Bay

yellow warning - heat - in effect

Areas: Kakabeka Falls - Whitefish Lake - Arrow Lake

29/07/2026, 20:43:55 → 30/07/2026, 12:43:55

Humidex values reaching 33 are expected for the next day. A heat event continues. What: Daytime highs of 29 to 32 degrees Celsius. Humidex values of 33 to 38. Nighttime lows of 16 to 20 degrees Celsius, providing little relief from the heat. When: Now through Thursday and possibly into Friday. Additional information: This heat event is expected to end on Thursday evening, but may 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. ### 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: Kakabeka Falls - Whitefish Lake - Arrow Lake

29/07/2026, 20:43:55 → 30/07/2026, 12:43:55

Humidex values reaching 33 are expected for the next day. ### 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, 20:42:44 → 30/07/2026, 12:42:44

### 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, 20:42:44 → 30/07/2026, 12:42:44

The multi-day heat event continues. What: Daytime highs of 29 to 31 degrees Celsius. Humidex values of 33 to 38. Nighttime lows of 16 to 20 degrees Celsius, providing little relief from the heat. When: Through Thursday and possibly into Friday. Additional information: This multi-day heat event is expected to end on Thursday evening, but may 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.