Ontario: Most of Family Day will be pleasant, but unsettled weather will return

Digital Writers
Ontario: Most of Family Day will be pleasant, but unsettled weather will return

Sunday will remain mild with slightly above seasonal temperatures across southern Ontario. Areas near Georgian Bay could see some lingering lake-effect flurries, but will taper off during the afternoon. Otherwise conditions will remain dry and pleasant through most of Family Day. An incoming Colorado low will begin to make its way through the southwest late Monday evening and will reach the GTA through the overnight hours, bringing unsettled conditions into Tuesday. We have more details on timing and precipitation types with the next system, below.


  • Temperatures remain slightly above seasonal Sunday, cools off slightly for Family Day Monday
  • Messy storm setup for late Monday with arrival of Colorado low, threatening snow, rain/snow mix, showers into Tuesday morning
  • Stay up-to-date on the ALERTS in your area


Aside from some lake-effect snow squalls off Georgian Bay, which should ease off through the afternoon, Sunday will be a pleasant day in the south with a sun/cloud mix for the afternoon. Temperatures will be slightly above seasonal and will hover around the 3-5-degree range for many areas.


The calm conditions will continue through the day Monday, with slightly cooler temperatures, before a Colorado low moves in through the evening and overnight hours.

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A Colorado low will track into the Great Lakes region Monday night and into Tuesday morning. Rain/snow mix will begin in the southwest late Monday evening while snow will move into GTA overnight. It will start off as snow for the GTA before transitioning to a rain/snow mix and then showers Tuesday morning, tapering off by the afternoon in the south as the system tracks through eastern Ontario and southern Quebec.


Snowfall amounts in the GTA will be limited because of the quick changeover to a rain/snow mix and then showers. Areas near and north of the 401 could see 5+ cm of snow before the changeover to rain occurs.

The further north, west and east you go, away from the GTA, you will see higher snowfall amounts. Between 10 to 15 cm of snow is expected for cottage country, 10-20 cm for Sudbury and the Nickel Belt regions and 5-10 cm for eastern Ontario and areas along Lake Huron through Tuesday afternoon.

"However, colder weather will return Tuesday night and into Wednesday and any standing water or leftover slush will turn to ice," says Weather Network meteorologist Dr. Doug Gillham, adding another quick shot of arctic air will usher into the region by mid-week. Temperatures will be well below seasonal for Wednesday and Thursday.


Although parts of next week will feature more arctic air, overall there's no consistent cold weather in sight for the rest of February.

"Mild Pacific air is expected to return by the end of the week with above seasonal temperatures likely for next weekend and into the following week," Gillham says.


Stay with us here at The Weather Network for all your latest forecast update.