Environment Canada is warning of significant amounts of rain in the Greater Toronto Area and other parts of southern Ontario that will make roads wet and slippery on Sunday.
It forecasts 20 to 44 millimetres of rain in Toronto, Guelph, Oakville, Hamilton, Kitchener, London, Vaughan, Niagara Falls, Oshawa, Markham, Richmond Hill and other areas.
Rainy conditions will begin Sunday morning and will be heavy at times. The rain will eventually reduce to isolated showers at night.
Environment Canada is urging people to stay away from washouts near rivers, creeks and culverts, and keep children and pets away from creeks and river banks.
Toronto and Region Conservation Authority says a Flood Outlook, Watershed Conditions Statement is in effect until 10:00 p.m. Monday.
It says the combination of rainfall, above-freezing temperatures, frozen ground, ice and snow melt could create dangerous conditions near rivers or other water bodies and advises people to avoid all shorelines and rivers within the GTA.
Environment Canada also issued a fog advisory for Toronto and surrounding areas early Sunday morning, warning fog was expected to cause near-zero visibility. The advisory has since been lifted.