Southwesterly winds are bringing some icy temperatures to the Toronto region, prompting the city to issue a cold weather alert. But the cold won't last through the week, according to forecasts.

Environment Canada is calling for a daytime high of -9 Celsius on Sunday, with the temperature plunging to -17 C overnight.

The normal highs and lows for this time of year are -2 C and -10 C respectively.

The city issues a cold weather alert when the temperature dips below -15 C, which then allows staff to open up more shelter beds for the homeless.

While the icy weather will persist into Monday, a low pressure system will move into the region and bring warmer temperatures.

On Tuesday, the forecast predicts that freezing rain will fall in Toronto, with a daytime high reaching 4 C.