Last year it was punishing heat that threatened to ruin the May long weekend; this time it's the rain.

Environment Canada is telling southern Ontarians to expect rain clouds for most of the weekend, as the province's damp weather continues.

Rain clouds are expected to settle in Wednesday night and linger through Thursday, allowing only peaks of sunlight in the lead up to the long weekend.

Environment Canada senior meteorologist Dave Phillips said the sour weather is expected to break long enough to redeem Saturday, before settling in to sour Sunday and Monday with more rain.

Temperatures are expected to stay relatively unchanged through the long weekend, with highs expected to reach 23 C from Friday to Monday. Lows are expected to hover between 12 and 14 C, in line with averages.

Toronto faced the opposite problem during last year's May long weekend, when the city's medical officer of health issued a heat alert and advised people to stay out of the sun.

This year, sunshine has been in short supply.

Toronto has already received 67 millimetres or rain this month, just five millimeters shy of the city's average rainfall for the entire month of May.

But Phillips said the rainfall amounts are well short of May's record rainfall of 208 millimetres, set in 1942.

Check CTV Toronto's weather forecast here.