Winnipeg will see another beautiful, warm start to the week, but another low pressure system pushing northwards out of the United States will bring showers and thunderstorms back to the region for Tuesday and Wednesday.

Under the influence of a broad area of high pressure, Winnipeg will see beautiful conditions today with plenty of sunshine and a high temperature near 28°C. Winds will be light and humidity will be comfortable, leaving little to complain about! Later in the afternoon, a bit of cloud will begin spreading into the Red River Valley as a low pressure system begins moving into North Dakota.

Temperatures will remain mild tonight as warmer, humid air begins building into the province as the North Dakota low continues to approach. Temperatures in Winnipeg will drop to around 17°C with winds picking up out of the south to around 30 km/h. A few showers or thunderstorms may develop and move through the region overnight.

Winnipeg will see humidity levels increase on Tuesday as dew points climb into the upper teens; combined with a high near 29°C, humidex values are forecast to reach into the mid-thirties. The morning will bring mixed to cloudy skies as any nocturnal convection finishes moving through, then Winnipeg and the Red River Valley will see a few sunny breaks through the early afternoon.

As the heat and humidity builds, showers and thunderstorms will likely develop across much of southern Manitoba in the afternoon. Triggered by the incoming disturbance from North Dakota, the showers and thunderstorms will spread northeastwards through the night. There is a small chance some of these thunderstorms could be severe with large hail being the primary threat. There are indications that a few areas may see some training thunderstorms with local rainfall accumulations of 25-50 mm.

Wednesday will be a much cooler day in Winnipeg with high temperatures only near 22°C. While this is significantly cooler than the city has seen over the past while, it’s in fact near-seasonal for this time of year. Skies will remain mostly cloudy with a good chance of showers as the low centre itself moves through the region. Some breezy northwesterly winds will move in through the afternoon, picking up to around 30 km/h.

Skies will remain mostly cloudy on Wednesday evening with northwest winds near 20 km/h and a low near 14°C.

Long Range Outlook

Winnipeg will see a break from the heat through the remainder of the week with near-seasonal temperatures forecast. Skies look cloudier than not, with generally unsettled weather returning for the end of the week into the weekend.

Winnipeg’s seasonal daytime high is currently 22°C while the seasonal overnight low is 8°C.

Widespread rain across the Red River Valley on Friday will bring long-awaited relief from the drought that has been in place through the region this spring.

A low pressure system moving through North Dakota today will spread much-needed rain across southern Manitoba. Beginning in the morning as showers, the precipitation will gradually evolve into a steadier rain in the afternoon. There will be a chance for a few thunderstorms across the region, particularly through the morning near the American border. Winnipeg will likely see another 10 to 20 mm of rain by the time it all tapers off, with higher amounts of 20 to 40 mm further south in the Red River Valley. Localized amounts in excess of 50 mm are possible over the southern Red River Valley into southeastern Manitoba, but would be restricted to any areas that saw more intense thunderstorm activity.

The rain will come to an end Friday night. The cloud cover will then begin to break up as the temperature drops to a low near +4°C. The northerly winds of 20 to 30 km/h will taper off to light by early Saturday morning.

Saturday will bring light northerly winds to Winnipeg – a bit breezier at 15 to 25 km/h over the southern Red River Valley – and clearing skies. Temperatures will end up just a tad below seasonal with a high near 17°C. Skies will remain clear on Saturday night with temperatures dipping to a low near 7°C.

Sunday will be a beautiful day in Winnipeg as a ridge of high pressure moves through. Under sunny skies with light winds, temperatures will climb to a high near 23 or 24°C. Skies will remain clear Sunday night with a low near 8°C.

Long Range Outlook

Next week looks like it will bring beautiful summer weather with plenty of sun and highs in the upper 20’s!

Winnipeg’s seasonal daytime high is currently 20°C while the seasonal overnight low is 6°C.