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March is going to get mean in Southern Ontario this week, with heavy rain starting Tuesday night and plummeting temperatures later this week.

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Environment Canada issued a weather advisory saying between 20 and 40 millimetres of rain is forecast for Toronto through to Wednesday. It issued advisories for all of southern Ontario, from Windsor to Cornwall.

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“A series of low-pressure systems will lead to significant rainfall across parts of southern Ontario. Heavy downpours may cause flash floods and water pooling on roads,” the statement reads, adding that there could be rainfall warnings.

Bruce Peninsula and parts of central Ontario are expected to have a “prolonged period of freezing rain.” Petawawa could see up to 10 millimetres of rain.

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Winter not quite done with us yet

The rain comes before a steep drop in temperatures expected later this week after the sunny conditions of Sunday and Monday. Toronto should see a high of 13 C Tuesday and a low of 5 C in the evening. Wednesday should see a high of 11 C before dropping back down to -3 C at night.

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But Thursday and Friday will see temperatures drop to 1 C. Flurries may also arrive on those two days, Environment Canada says.

Messy March

March is always a wild weather month in Toronto, where all four seasons can arrive in one week and you can see people with parkas and waterproof jackets on the street at the same time. Winter can stubbornly hang on with the occasional tease of springtime. Temperatures tend to hover around freezing, with slushy conditions.

It’s a wet month for the city; freezing rain as a common risk with warm fronts colliding with lingering cold air. Skies tend to be grey and overcast, though more sunlight in the daytime makes it less gloomy than January and February. Those living closest to Lake Ontario see cooler temperatures than northern parts of the GTA such as Richmond Hill or Vaughan.

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