Mild and Breezy Before Mid-Week Cool-Down

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After a mild start to the week, cooler weather will return to Winnipeg.

An upper ridge over the Canadian Prairies will help send temperatures back into the 20s to start the week. Winnipeg will see a few clouds today, but skies will also be a bit hazy with forest fire smoke. Temperatures will climb to around 20 °C, accompanied by a brisk southeast wind. As the day progresses, the winds will pick up to 30 gusting 50 km/h for the afternoon.

While the skies will be hazy with smoke, air quality should stay good as the smoke will reside higher in the atmosphere.

Tonight, a low pressure system will track along the international border and spread cloud cover through the region. The wind will ease this evening and temperatures will stay mild with a low of 12 °C.

On Tuesday, Winnipeg will see mixed skies as the low departs to the east. Winds will pick up out of the northwest into the 20–30 km/h range by midday. Fortunately, temperatures will continue to be seasonably mild with a high near 20 °C. A bit of haze may linger from the fires, but the thickest plume will be slumping southwards into the American Plains.

RDPS 2m Temperature Forecast valid 06Z Wednesday September 16, 2020
A cold front will surge southwards through central Manitoba on Tuesday night.

Tuesday night will bring Winnipeg partly cloudy skies, light winds, and a low near 7°C.

A cold front will slump through the Red River Valley on Wednesday morning, bringing a few clouds with a chance of showers. The northwest winds will strengthen back to 30 gusting 50 km/h and keep temperatures cool with a high of just 11 °C. A ridge of high pressure will move into the region on Wednesday night and bring mostly clear skies, light winds, and a low near +1 °C.

Long Range Outlook

The rest of the week will bring partly cloudy skies and seasonably cool temperatures to Winnipeg. On the weekend, temperatures will climb back into the upper teens with increasing cloudiness. Some rain may be possible on Sunday, but will be conditional on how exactly the forecasted low tracks eastwards.

Today’s seasonal daytime high in Winnipeg is 18°C while the seasonal overnight low is 6°C.

Cooler, Pleasant Weekend Ahead

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Winnipeg will see seasonably cool weather right through the weekend with otherwise pleasant conditions.

A ridge of high pressure will bring sunny skies to the Red River Valley as it pushes into the province today. Winds will be breezy out of the northwest again at 30 gusting 50 km/h, keeping temperatures cool. Winnipeg should see a high near 20 °C. Skies will stay mostly clear tonight as the winds ease off and temperatures dip to a low near 7 °C.

Saturday will bring a return to seasonal temperatures for Winnipeg with a high near 22 °C. Winds will stay light as they shift to the southeast for the afternoon. Skies will start off sunny, but more cloud will build into the region through the afternoon. The cloudier conditions on Thursday night will help keep temperatures slightly warmer with a low in Winnipeg near 13 °C.

RDPS 2m Temperature Forecast valid 21Z Saturday September 5, 2020
On Saturday, an approaching low pressure system will bring summer heat to southern Saskatchewan and southwestern Manitoba with highs of 25–30°C. Unfortunately, the Red River Valley won’t see any of that; it will drop southwards into the Dakotas as it approaches.

A disturbance passing through the region on Sunday will bring mainly cloudy skies to the city. Temperatures will reach a high near 20 °C, but a cold front sweeping through in the afternoon will usher in significant change. Winds will shift northwesterly at 20–30 km/h in the afternoon behind the front and usher in a much cooler air mass. Skies will stay mostly cloudy right through Sunday night as temperatures dip to a low near 8 °C.

While this system will spread rain across Manitoba on Sunday, it should stay well north of the city. Areas from west-central Manitoba southeastwards into the Pinawa region will likely see around 10 mm of rain through Sunday.

Long Range Outlook

Daytime highs will plummet well below seasonal values to start the week as highs struggle to climb over 10 °C. On Monday and Tuesday, a persistent north wind combined will produce lake-effect showers in the lee of both Lake Manitoba and Winnipeg. Winds will shift westerly on Wednesday, bringing an end to the lake-effect precipitation and gradually pushing temperatures back towards seasonal values.

Also on Monday, an upper-level disturbance will drop into the region. It will spread a broad area of showers that will likely move through the Red River Valley as well.

Today’s seasonal daytime high in Winnipeg is 21 °C while the seasonal overnight low is 8 °C.

More Rain on the Way

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A clipper system will begin racing eastwards across the Prairies today, spreading rain into the Red River Valley.

Winnipeg will see a pleasant start to the day; with sunny skies temperatures will climb to a high near 21 °C with westerly winds near 20 km/h. Later today, a clipper low racing across Saskatchewan will spread cloud into the Red River Valley, followed by rain beginning mid- to late-afternoon. The rain will last into the evening, then ease to a few showers and end overnight. Most areas in the Red River Valley, including Winnipeg, will see 5 to 15 mm of rain, but a localized corridor of 15 to 25 mm will be possible. Temperatures will dip down to a low near 10 °C tonight with winds picking up out of the northwest.

Thursday will bring mixed skies with a chance for some lake-effect showers in the morning. Winds will be prominent through the day, sustained out of the northwest up to 40 gusting 60 km/h. It will be a cool day in the wake of Wednesday’s clipper and Winnipeg will see a high of only 17 °C. Skies will clear out in the evening as the winds gradually ease. Temperatures will then head to a low near 6 °C.

NAM 24hr. Precipitation Accumulation Forecast valid 15Z Thursday September 3, 2020
Southern Manitoba will see another soaking as rain moves through on Wednesday afternoon and evening.

On Friday, a weak ridge of high pressure will keep skies mainly sunny with northwest winds of 20–30 km/h. Temperatures will recover slightly from Thursday as Winnipeg heads to a high near 20 °C. A bit of cloud will work into the region overnight as temperatures head to a low near 7 °C and winds ease.

Long Range Outlook

Another low pressure system will cross Manitoba this weekend, but most forecasts show the rain it will bring tracking through WestMan and the Interlake. Winnipeg will likely see mixed skies on Saturday with near-seasonal temperatures, but cloudier, cooler conditions return on Sunday. The weekend may end with a chance of showers as a cold front plunges southwards through the province.

Today’s seasonal daytime high in Winnipeg is 21 °C while the seasonal overnight low is 8 °C.