Environment Canada says localized pockets of heavy flurries may affect areas near the west end of Lake Ontario this morning and into the afternoon due to increasing northeast winds.
Several centimetres of snow along with brief periods of low visibility are likely.
More widespread snow associated with a passing low pressure system is then expected to move into the region early this evening and end later Monday morning.
Snowfall amounts are generally expected to be in the 5 to 10 cm range.
However, for areas stretching from Hamilton towards Grimbsy, there is a possibility that amounts may exceed 15 cm. The area is being monitored for a potential snowfall warning.
Travel may be hazardous at times today and especially tonight into Monday morning.