A rainfall warning is in effect for areas north of the GTA, from Goderich to Barrie, up to Collingwood and the Muskoka and Algonquin areas.
Environment Canada says another bout of rain will move into Southern Ontario later this morning from the west and will continue through tonight and into Monday.
The agency says rainfall amounts will likely be in the 25 to 50 mm range by Monday morning. But a swath from the Bruce Peninsula across Georgian Bay to Parry Sound and Huntsville could see amounts of 40 to 60 mm by Monday morning.
The rain will continue through Monday with total rainfall amounts possibly reaching 50 to 75 mm by Tuesday morning.
Even though Belleville is not part of that warning, officials there are worried about the rain the next couple of days, saying it could cause water levels to increase by up to eight centimetres.
They have been under a state of emergency since Thursday because melting snow is causing major flooding.
A flood warning has also been issued for the City of Kawartha Lakes.