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We break down what to expect from the Labour Day holiday weekend.

Heat and Humidity Return for the Labour Day Long Weekend

Dr. Doug Gillham
Meteorologist, PhD

Wednesday, August 27, 2014, 5:44 PM - Tuesday was one of the hottest days of the summer for parts of southern Ontario. 

At Pearson airport, the temperature reached 32.2oC (humidex of 40), surpassing 30.0oC for the first time since June 30.  

Since records began in 1937, there has not been a summer in which both July and August failed to reach 30oC, and that streak is still intact after yesterday. Our temperature could reach 30oC again on Saturday as the heat and humidity return to southern Ontario for most of the Labour Day long weekend.  

However, we have a brief hint of autumn in the meantime with noticeably cooler temperatures and less humidity for Wednesday night through Friday morning. Overnight low temperatures will drop to the lower teens both nights. 

On Friday, the humidity will start to return. The approaching warm front will bring the threat for a shower or thunderstorm, especially towards cottage country, but most of the day will be rain-free. 

Saturday will be much like Tuesday with a gusty southwest wind, temperatures in the upper 20s to near 30oC and a humidex that could approach 40. 

Late in the day the threat for showers and thunderstorms will increase, especially across cottage country. Most of the day will be rain-free in the GTA, but the threat for storms will increase as we head into Saturday night. 

The threat for showers and thunderstorms will continue into Sunday, but there will be rain-free periods with some sunshine mixed in as well.   

Scattered showers and thunderstorms are possible on Monday, especially late in the day, but overall, Labour Day should be drier than Sunday. Temperatures will remain above seasonal with highs in the mid to upper 20s and a Humidex in the low to mid 30s. 

As children head back to school next week, temperatures should continue to feel more like late summer rather than early autumn for most of the week. While we had very little hot weather during July and August, summer is not over just yet as September will bring periods of warm weather to Southern Ontario. 

TUNE IN: Watch the Weather Network on TV as we keep an eye on the approaching long weekend.

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