Some light snow will continue this morning with little accumulation. Overall, a mild day with a high near 0°C to 1°C. The high may not actually be reached until evening however.
Clipper system begins moving in tonight. A period of showers, freezing rain or ice pellets looks likely later in the evening and overnight. Not expecting much accumulation, but this will definitely make roads quite slick.
Periods of snow will begin sometime around midday tomorrow and continue until early Monday. Temperatures will plummet tomorrow afternoon along with this snow, dipping into the mid minus teens by Monday morning. Strong northwest winds will create blowing and drifting snow both tomorrow and Monday. As for snowfall totals, 3-6 cm looks like a good range for Winnipeg right now, but will update in the comments if that changes.
We'll struggle to exceed -10°C on Monday. Skies should clear in the afternoon or late day.
The core of the cold air does not reach us until Wednesday-Thursday. Absolutely dreadful temperatures are expected late week with highs in the mid minus teens and lows well into the -20's likely... Cold even by January standards and at least 10°C below normal for late November.