Winnipeg will see below-seasonal temperatures remain in place for the remainder of the week. Rain returns to the region late Thursday, spread northwards by a low pressure system crossing the northern United States.
Winnipeg will see skies clear through the morning today as a ridge of high pressure builds into the region. Unfortunately, this same ridge will also reinforce the seasonably cool temperatures in place over the region. With a light northerly wind, Winnipeg will see a high near 14°C today. This is a few degrees cooler than typically seen around this time of year. With clear skies in place for much of the night, temperatures will dip to a low near +2°C.
There will be a risk of frost with these cool lows, especially further west in the Red River Valley where temperatures may dip a degree or two lower. Further west into southwestern Manitoba will likely see at least patchy frost with widespread lows near 0°C. Cloud cover will begin building in overnight, mitigating some of the frost threat.
Cloud cover will spread across southern Manitoba on Thursday in advance of a low pressure system moving through the northern US. Much of the day will remain dry, but this low will slowly increase winds out of the north to 20 to 30 km/h. Rain will begin spreading out of North Dakota into southern Manitoba by late in the afternoon.
Accumulating rain will mainly be along and south of the Trans-Canada Highway from the Saskatchewan border eastwards across the Red River Valley, and throughout the southeastern corner of the province. General amounts of 10-20 mm are forecast to fall with rapidly diminishing accumulations north of the main band of rain. Embedded convection could result in localized areas where rainfall totals could reach into the 20-40 mm range. This seems more likely closer to the US border.
All that cloud will keep overnight lows near-seasonal; Winnipeg should see temperatures dip to 5°C.
As the disturbance exits the region on Friday, another ridge of high pressure will build in from the northwest. The cloud will break up on Friday morning as the winds gradually diminish. Temperatures in Winnipeg will once again be cool with a high near 15°C.
More cloud cover will push in Friday evening ahead of the next disturbance forecast to move through the region. Winnipeg’s low is forecast to fall to around 5°C on Friday night.
Long Range Outlook
More cloud with a chance of rain will move through on the weekend as a weaker clipper system zips across the southern Prairies. Temperatures will remain cool with daytime highs in the low teens and near-seasonal overnight lows.
Winnipeg’s seasonal daytime high is currently 17°C while the seasonal overnight low is 5°C.
