Today – September 4, 2023
Mainly sunny. Wind becoming west 20 km/h this morning. High 31. Humidex 40. UV index 7 or high.
Heat warning
Hot and humid conditions are expected through Wednesday.
Hazards:
Maximum temperatures of 30 to 34 degrees Celsius.
Humidex values near 40.
Timing:
A cooler air mass is expected Thursday.
Discussion:
A hot and humid airmass is expected through Wednesday. As the week progresses, daytime highs are expected to be 30 to 34 degrees Celsius. The hottest day looks to be Tuesday. Overnight lows will be in the high teens to low twenties bringing little relief to the heat. Humidex values and daytime highs will be very atypical of early September.
The passage of a cold front will bring an end to the heat Thursday.
Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.
The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
Drink plenty of water even before you feel thirsty and stay in a cool place.
Check on older family, friends and neighbours. Make sure they are cool and drinking water
Never leave people or pets inside a parked vehicle.
Outdoor workers should take regularly scheduled breaks in a cool place.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm.
Tonight
Clear. Low 21.
Tue, 5 Sep – Sunny. High 32. Humidex 39. UV index 8 or very high. Night – Cloudy periods. Low 22.
Wed, 6 Sep – A mix of sun and cloud with 30 percent chance of showers. High 30. Night – Cloudy with 60 percent chance of showers or thunderstorms. Low 20.
Thu, 7 Sep – Cloudy with 40 percent chance of showers. High 25. Night – Cloudy with 40 percent chance of showers. Low 16.
Fri, 8 Sep – Cloudy with 30 percent chance of showers. High 22. Night – Cloudy periods. Low 13.
Sat, 9 Sep – A mix of sun and cloud. High 22. Night – Cloudy periods. Low 12.
Sun, 10 Sep – A mix of sun and cloud. High 24.
