Torontonians are happily welcoming this week's above-zero temperatures, but the city is warning the warmer weather could cause some flooding problems.

Environment Canada expects every day this week will break the freezing mark, with a weekly high of 9 C coming on Tuesday, but nighttime temperatures will dip back below 0 C.

The warmer temperatures, combined with a relatively large amount of snow on the ground after a bitterly cold winter, could cause basements and areas near waterways to flood.

Warmer weather is on the way this week, which the city warns means there could be some flooding in areas near Toronto's waterways. (Nathan Denette/The Canadian Press)

On Twitter, the City of Toronto warned the melting snow will need somewhere to go and urged residents to make sure their catch basins and downspouts weren't blocked by ice.

City road crews are also taking advantage of the clear streets to make pothole repairs.

Hector Moreno, the city's road operations manager, said around 100 workers are out and so far this year they've repaired some 31,000 potholes — at a cost of around $750,000.

Last year, the city had spent $1.2 million at this point in the year to fill in 66,000 potholes.

Moreno credits a consistently cold winter, instead of the extreme up-and-downs of last year, for keeping more of the road intact.

Watch out for 'ice dams'

Meanwhile, roofers like Shay Barat will be busy guarding against "ice dams," which build up on houses as the temperature seesaws around the freezing mark.

"If we get more melt, we get more (ice) buildup," Barat said, noting this becomes an issue the longer it goes on.

"It keeps building up and building up all the way up the roof."

The thaw, however, will be welcome news to those who struggled with frozen pipes for the past two months and to city staff who struggled to keep vital infrastructure functioning amid the cold.