Sun to finally appear in southern Ontario, but with a frosty price

We knew it was going to happen in southern Ontario eventually, but we always thought there would be more time before it occurred. While we're not talking about snow, just yet, we are looking at the chance of frost.

While the region will finally see its long-lost friend, the sun, on Sunday after weeks of cloudy skies and recent rainfall, it will come with a chilly and possibly frosty cost.

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The first frost risk will occur Sunday night as overnight lows dip below the freezing mark. Even southwestern and eastern Ontario, as well as the Greater Toronto Area (GTA), may not be spared from the frost. Make sure to protect your vulnerable crops and plants.

Chilly air brings first frost risk Sunday night

Sunday will feature plenty of weather we haven’t witnessed across southern Ontario in quite a while.

For the first time in weeks, we’ll see significant clearing on Sunday as that departing system clears out of the region. Clouds have been a mainstay in the skies over the GTA lately. Toronto has endured 18 straight days with minimal sunshine.


That long-awaited sunshine comes with a downside for warm-weather lovers, unfortunately, as much cooler air pushes into southern Ontario.

Chilly, northwesterly winds will keep daytime high temperatures in the single digits for most of the province. It’s been more than four months since Toronto last saw a high temperature below 10°C.

Brisk daytime temperatures and limited clouds Sunday night will bring about low temperatures dipping awfully close to the freezing mark.


Sunday overnight can expect to see limited cloud cover, sending temperatures plummeting below the freezing mark. As a result, there will be a frost risk. Geographical location may not be a saviour.

Those in the southwest and eastern areas, and along the lake shores hugging the GTA, may not be spared, either, as the temperatures are expected to plummet into the negative digits across southern Ontario.
It’s not unusual to get frost this time of year near Toronto and the Golden Horseshoe. In fact, we are actually a few days behind our average.


This will lead to a risk for the first frost of the season in many communities, including the City of Toronto, Mississauga, Oakville, Burlington, and Hamilton.

Everyone should take proper precaution with their vulnerable crops and plants, wrapping and protecting them from any potential frost damage.

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Stay tuned to The Weather Network for the latest forecast updates in Ontario.