Weather rollercoaster: Southern Ontario to see significant temperature-drop by weekend

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    While temperatures will rise to 20 C by Wednesday, be prepared for some Arctic air in the early morning hours. Some parts of the province could even see some snow.

    By Lucas Casaletto

    Ontarians could see Mother Nature at her finest and then her worst in a matter of days, with temperatures reaching 20 C mid-week, only to fall as low as 10 degrees by the weekend.

    Most of southern Ontario will be greeted with sunny skies on Tuesday and Wednesday, with temperatures on the latter day topping out at 21 C.

    That will be short-lived thanks to a lobe of Arctic air moving into that part of the province that will see a dip of around 10 degrees by late Thursday into Friday morning — just in time for Thanksgiving.

    CityNews weather specialist Emily Vukovic says wet snow is possible for parts of northern Ontario by early Thursday.


    RELATED: Fall arrives — Warmer-than-normal temperatures expected to ‘dominate’ the season


    “Friday, things change dramatically, dropping to a daytime high of 13 C,” Vukovic says.

    “In some areas throughout southern Ontario, especially further north, there is potential for some wet snow. Temperatures will be that cold, so that precipitation could easily transition over.”

    There is also a high probability of frost, particularly as temperatures drop overnight. The risk of frost will become more widespread in southern Ontario at the end of the week.

    According to The Weather Network, if Toronto only reaches 9 C on Friday, it will be the city’s first single-digit high temperature in over 150 days. The last time Toronto recorded a daytime high of below 10 C was a 4.7 C reading on April 27, 2022.

    Fret not, however. Just a few weeks ago, The Weather Network released its annual fall forecast, and the outlook suggests extended periods of pleasant weather through October.

    Meteorologists warn that much of Ontario could see more typical late-fall weather when November arrives, with temperatures expected to cool significantly.


    With files from Michael Ranger of CityNews

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