Latest Alert For: Weather Alerts
Multiple active bulletins issued for this subscription.
Latest bulletin issued on Saturday July 4, 2026 17:46 CDT by Environment Canada.
- Simcoe - Delhi - Norfolk, Ont. (041100) Saturday July 4, 2026 14:06 CDT
- Dunnville - Caledonia - Haldimand, Ont. (041200) Saturday July 4, 2026 17:46 CDT
- Windsor - Leamington - Essex County, Ont. (041420) Saturday July 4, 2026 14:06 CDT
- London - Parkhill - Eastern Middlesex County, Ont. (041510) Saturday July 4, 2026 14:06 CDT
- St. Thomas - Aylmer - Eastern Elgin County, Ont. (041610) Saturday July 4, 2026 14:06 CDT
- Oxford - Brant, Ont. (041700) Saturday July 4, 2026 17:46 CDT
- City of Hamilton, Ont. (046100) Saturday July 4, 2026 17:46 CDT
- Niagara, Ont. (046700) Saturday July 4, 2026 17:46 CDT
- City of Toronto, Ont. (043100) Saturday July 4, 2026 17:46 CDT
- York - Durham, Ont. (043200) Saturday July 4, 2026 17:46 CDT
- Belleville - Quinte - Northumberland, Ont. (043300) Saturday July 4, 2026 17:46 CDT
- Listowel - Milverton - Northern Perth County, Ont. (046320) Saturday July 4, 2026 17:46 CDT
- Stratford - Mitchell - Southern Perth County, Ont. (046340) Saturday July 4, 2026 17:46 CDT
- Guelph - Erin - Southern Wellington County, Ont. (046420) Saturday July 4, 2026 17:46 CDT
- Kitchener - Cambridge - Region of Waterloo, Ont. (046430) Saturday July 4, 2026 17:46 CDT
- Halton - Peel, Ont. (046600) Saturday July 4, 2026 17:46 CDT
Public Alert Areas Map
- Subscribed Site
- Subscribed Sub-Zone
- Subscribed Zone
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Active Heat Warning
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Ended/Cancelled Heat Warning
- EC Sub-Zone Border
Alert Details
Issued on Saturday July 4, 2026 17:46 CDT
- Dunnville - Caledonia - Haldimand, Ont. (041200)
- Oxford - Brant, Ont. (041700)
- City of Hamilton, Ont. (046100)
- Niagara, Ont. (046700)
- City of Toronto, Ont. (043100)
- York - Durham, Ont. (043200)
- Belleville - Quinte - Northumberland, Ont. (043300)
- Listowel - Milverton - Northern Perth County, Ont. (046320)
- Stratford - Mitchell - Southern Perth County, Ont. (046340)
- Guelph - Erin - Southern Wellington County, Ont. (046420)
- Kitchener - Cambridge - Region of Waterloo, Ont. (046430)
- Halton - Peel, Ont. (046600)
Impact Level: Moderate
Forecast Confidence: High
The long duration heat event is expected to end early this evening.
What:
Humidex values near the mid thirties.
When:
Continuing through this afternoon.
Additional Information:
While temperatures are expected to be cooler than previous days, the humidity will remain high, resulting in uncomfortable conditions.
Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.
Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water.
Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.
Drink water often and before you feel thirsty to replace fluids.
Close blinds, or shades and open windows if outside is cooler than inside.
Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.
Follow the advice of your region’s public health authority.
Plan and schedule outdoor activities during the coolest parts of the day.
Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat.
Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.
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 X using #ONStorm.
Issued on Saturday July 4, 2026 14:06 CDT
- Windsor - Leamington - Essex County, Ont. (041420)
- Simcoe - Delhi - Norfolk, Ont. (041100)
- London - Parkhill - Eastern Middlesex County, Ont. (041510)
- St. Thomas - Aylmer - Eastern Elgin County, Ont. (041610)
Impact Level: Moderate
Forecast Confidence: High
The long duration heat event is expected to end tonight.
What:
Humidex values in the mid thirties.
When:
Continuing through this afternoon. Ending this evening.
Additional Information:
While temperatures are expected to be cooler than previous days, the humidity will remain high, resulting in uncomfortable conditions.
Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.
Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water.
Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.
Drink water often and before you feel thirsty to replace fluids.
Close blinds, or shades and open windows if outside is cooler than inside.
Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.
Follow the advice of your region’s public health authority.
Plan and schedule outdoor activities during the coolest parts of the day.
Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat.
Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.
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 X using #ONStorm.
Latest information is always available here:
https://weather.gc.ca/index_e.html?layers=alert
- Version:
- R046