It was day of heavy rain across the Greater Toronto Area on Tuesday, causing problems for commuters on their drive home.

Seventy-eight millimetres of rain fell in Markham by 2 p.m. on Tuesday afternoon, the equivalent of a whole month’s worth of precipitation.

While the mid-afternoon rainfall totals were considerably less in other places, like at Pearson International Airport (35 mm) and in downtown Toronto (17 mm), local flooding was reported in some areas.

A rainfall warning from Environment Canada remained in effect for Toronto as of 5:30 p.m.

The Toronto and Region Conservation Authority issued a flood warning for low-lying areas on Tuesday afternoon, which was expected to remain in effect until at least midnight.

Toronto police warned motorists to be careful on their drive home, both because of the slick roads and the specific instances of flooding that resulted from the rainfall.

"More rain to come this evening on the drive home," said a tweet from Const. Ryan Willmer.

"Slow down, turn your lights on and be courteous to other drivers and pedestrians."