For those hoping to soak up the sun this long weekend, beware. Environment Canada forecasts hot and humid weather for much of central and eastern Canada.

From the spectacular Caribbean Carnival festivities in Toronto to the streets of old Montreal to the shores of the Halifax harbour, families and friends sweated and smiled in temperatures that felt as high as 41 C with humidity on Saturday.

With those sweltering temperatures came a bevy of weather warnings and advisories issued by Environment Canada.

A smog and humidex advisory was issued for parts of southern Ontario stretching from Windsor to Ottawa. The agency lifted the warning shortly after 8:30 p.m as increased cloudiness and unsettled weathered helped clean the air of some of the smog pollutants.

Heat alerts were also in effect for much of the province, as temperatures in some regions rose to 35 C.

A heat and humidity warning was issued for southern Quebec, where the temperature rose to a sweltering 40 C. The weather advisory is expected to remain in effect until late in the day on Sunday.

Environment Canada warned that the smog poses extra concern to individuals with heart or lung disease and encouraged residents to “spare the air” and take public transit or car pool.

Residents in the affected areas are encouraged to stay in air-conditioned buildings or to seek shady areas. Environment Canada also suggests drinking plenty of water and limiting physical activity and health officials say it’s beneficial to limit the amount of dehydrators including alcohol and caffeine.  

Relief from the heat is expected by Sunday morning as early morning showers in Toronto, Ottawa, Montreal and Quebec City, combined with cold winds blowing in from the north, should send temperatures dropping.

For a full listing of Environment Canada’s weather warnings, please follow the link.