You might want to dig out your thick winter jacket from storage this week, because temperatures in Toronto are due to feel below freezing as the first blast of winter-like weather arrives. 

It's been a relatively mild fall season so far, with daytime highs hovering around the 15 C range for the most part, however, all that is set to change this upcoming weekend. 

According to The Weather Network's seven-day overnight forecast, Toronto will see a daytime of 15 C and nighttime low of 7 C on Friday, in line with the same weather we've been seeing the past few weeks. 

On Saturday, temperatures will slowly start to dip at night when it'll feel like 3 C, but the day will still remain on the warmer side with a high of 14 C. 

Sunday is when temperatures will really get chilly, with The Weather Network forecasting that the nighttime low will actually feel below freezing at -2 C, marking the first time we'll feel sub-zero temperatures this season. 

The cold plunge will be relatively short-lived, as temperatures will rise once again on Monday, when Toronto is forecasted to get a daytime high of 12 C. 

Mild to warmer temperatures are expected to continue through the rest of the week, with a daytime high of 15 C on Tuesday and 17 C on Wednesday. 

The shift to winter-like weather is line with the agency's "fickle fall" forecast, which predicted that bone-chilling temperatures would arrive in October in advance of the winter season.