Toronto remains under an extreme cold weather alert for a second day, with temperatures expected to drop even further.

By 5 a.m. on Thursday, it was already -16 C, and it felt like -20 C with the windchill, CityNews weather specialist Eva Fragiskatos said.

Later Thursday morning, Environment Canada expanded a windchill warning for most of the GTA to include Toronto.

The agency said temperatures have dropped to between -20 C and -30 C, but it will feel more like -30 C to -40 C overnight. People in the area are advised to cover exposed skin when heading outdoors.

There is some light snow in the forecast and the temperature will remain chilly through Friday.

A warm-up is expected on the weekend, either on Saturday or Sunday.

Click here for the full forecast.

Extreme cold weather alerts are called when Environment Canada forecasts an overnight temperature of -15 C or lower, issues a windchill warning or predicts extreme weather conditions.

Extra shelter spaces are made available and overnight street outreach is increased in the downtown core to get the homeless in from the cold.

TTC tokens are also offered so that people can use public transit to get to shelters.