Warm Holiday Monday Followed by Mid-Week Cool-Down

Winnipeg will see a beautiful holiday Monday followed by a quick reminder that colder weather lurks not so far away.

Winnipeg will see temperatures climb today as a push of warmer air moves through the region. It will start off this morning with some cloud and a chance of showers as an occluding trowal lifts through the region. Moderate south-southwest winds of 30–40 km/h will persist through the day as skies clear behind a weak cold front. The region will see markedly warmer temperatures than yesterday with a high near 25 °C. Winds will ease in the evening as temperatures head to a low near 14 °C under mainly clear skies.

RDPS 2m Temperature Forecast valid 21Z Monday May 24, 2021
Southern Manitoba will see a mild temperatures for the holiday Monday with highs in the mid-20s.

A low pressure system will push eastwards out of Saskatchewan across Manitoba on Tuesday. As it moves into the region, Winnipeg will see increasing cloud and southwest winds near 30 km/h. Temperatures will climb to a high near 19 °C by late in the morning. A cold front will sweep through the Red River Valley as the low passes in the afternoon. This will bring scattered showers into the region along with moderate northwest winds up to 40 gusting 60 km/h. The chance for showers will taper off into the evening, but the moderate northerly winds will continue for much of the night. A large Arctic ridge will push into the region behind the cold front, sending Winnipeg’s low close to the freezing mark by Wednesday morning.

That Arctic high will lay across the entirety of Manitoba on Wednesday, bringing a cool day to the region. Winnipeg will see a high only around 11 °C with northerly winds near 20 km/h. With that late-May sunshine, a sunny start to the day will likely see some afternoon cumulus clouds despite the cool temperatures. Skies will stay mainly clear on Wednesday night with light winds. Temperatures will likely dip below freezing in outlying areas, and drop close to freezing closer to the city centre.

RDPS 2m Temperature Forecast valid 12Z Thursday May 27, 2021
…and the mighty have fallen; much colder temperatures will arrive mid-week. Much of southern Manitoba will see a hard freeze or risk of frost Tuesday night and Wednesday night.

This Arctic high will bring a risk of frost to much of southern Manitoba on both Tuesday night and Wednesday night. Areas north of the Trans-Canada highway as well as southwestern Manitoba will likely see a hard freeze. For the Red River Valley, frost is more likely in rural areas than in the City of Winnipeg. While it’s less likely to freeze in the city centre, open and outlying areas of the city will see a higher risk of frost both nights. Temperatures are not forecast to drop much below zero in the Red River Valley, and will recover quickly above freezing both Wednesday and Thursday morning.

Long Range Outlook

Temperatures will recover through the rest of the week back towards seasonal values with partly cloudy skies. A weak low passing on Saturday will bring more cloud and a chance of showers to the region. After that, it looks like a nice stretch of seasonal temperatures with variable cloudiness will start off the next week.

Today’s seasonal daytime high in Winnipeg is 21 °C while the seasonal overnight low is 7 °C.


Brad lives in Winnipeg with his wife and two children and is the founder of A Weather Moment. He has loved weather from a very young age and has followed that passion through his life so far. He received a B.Sc. in Earth Sciences with Specialization in Atmospheric Sciences and is currently employed in the field of meteorology. You can find the author as @WeatherInThePeg on Twitter.