42°59'N / 82°24'V / Altitudine 178 m / 13:35 18.05.2026, America/Toronto (UTC-4)
de la: 18.05.2026, 12:00
la: 19.05.2026, 02:52
Yellow warning - heat - in effect The first heat event of the season will begin this afternoon and is expected to continue into Tuesday. What: Daytime highs near 30 degrees Celsius. Humidex values near 36. Overnight lows of 18 to 20 degrees Celsius. When: Beginning this afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: Temperatures may be cooler along the lake shores. ### 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 [email protected] or post reports on X using #ONStorm.
Sarnia - Petrolia - Western Lambton County
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.
Environment Canada
18.05.2026, 10:52
de la: 18.05.2026, 15:00
la: 19.05.2026, 02:02
Yellow watch - severe thunderstorm - in effect Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and large hail. Hazards: Wind gusts up to 100 km/h Hail up to toonie size Timing: This afternoon and evening Additional information: Thunderstorms are expected to move eastward into the area from Lower Michigan. The main hazard will be damaging wind gusts. ### Local utility outages are possible. Damage to roofs, fences, branches or soft shelters is possible. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to [email protected] or post reports on X using #ONStorm. For more information: https://www.ontario.ca/page/be-prepared-emergency.
Sarnia - Petrolia - Western Lambton CountyWhen thunder roars, go indoors! Lightning kills and injures Canadians every year.
Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.Environment Canada18.05.2026, 13:06