Toronto police have issued a warning for residents to stay off ponds and lakes that appear to be frozen because of milder temperatures in the forecast.

"These milder temperatures and rain will cause the snow to melt, and rivers and streams to swell, resulting in fast-moving water," read a statement.

"Ice over ponds, small lakes, and flood-control areas should also be treated as unsafe, at all times, unless they have been certified safe by the authorities."

Environment Canada says temperatures in Toronto will hover around 6 C on the weekend, with a 70 per cent of rain on both days.

The mercury is expected to rise to double digits at the start of the workweek, with 10 C predicted for Monday and 13 C forecast for Tuesday. Rain is also likely on both days, the weather service said.

The temperature is expected to drop down to 2 C on Wednesday, and there is a 70 per cent chance of showers.

On Thursday, York Regional Police issued an advisory for snowmobilers and ice fishermen to stay off Lake Simcoe after the bodies of two Georgina men were pulled from the water.

Stephen Docherty, 43, and William Cameron, 40, went out snowmobiling on the south end of the lake on New Year's Day and never returned.

"There are still many areas of open water on Lake Simcoe and ice fishermen and snowmobilers are reminded that conditions are dangerous and extreme caution should be used," stated the York police press release.