Cooler, Cloudier, and Windier Weather Ahead

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Seasonably cool temperatures have arrived in Winnipeg and will stick around for the week. Alongside them, the city will see increasingly unsettled and windy coconditions.

The city will start the week with a sunny and breezy day in the wake of yesterday’s rain. Temperatures will climb to a cool high near 19 °C with breezy westerly winds of 30 gusting 50 km/h. A ridge of high pressure moving through overnight will keep skies clear but send temperatures plummeting. Winds will taper off the in the evening, then temperatures will head to a low near 6 °C in Winnipeg.

On Tuesday, a trough will swing across southern Manitoba, bringing seasonal temperatures back to the region. It will also bring plenty of cloud cover. Skies will be mostly cloudy in Winnipeg with a high near 22 °C and west-southwest winds into the 30–40 km/h range. The city will see a chance of showers in the afternoon and evening, but rain is more likely across the Interlake into the southeast corner of the province. Temperatures will dip to a low near 9 °C on Tuesday night with clearing skies and easing winds.

NAM 24hr. Precipitation Accumulation Forecast valid 12Z Thursday September 3, 2020
Rain will spread across southern Manitoba on Friday into Friday night.

On Wednesday, a low pressure system will move across southern Manitoba. As it pushes east, it will spread cloud into the region as it lifts a sharp warm front north of the border. Winnipeg should see a high near 22 °C again with some rain beginning later in the afternoon. The rain will continue into the evening and then taper off overnight. This system will bring 20 to 30 mm along a narrow west-east axis that is forecast to run across the Interlake. To it south, 5 to 10 mm is possible across the Red River Valley. That said, the outcome will be sensitive to the track of the low:

  • If the low tracks further north, Winnipeg may see slightly warmer temperatures and less rain.
  • If the low tracks further south, temperatures would be a couple degrees colder than forecast, and rainfall accumulations could significantly increase.

Temperatures will dip to a low near 7°C on Wednesday night with winds picking up out of the northwest to 30 gusting 50 km/h.

Long Range Outlook

Seasonably cool temperatures will move into Winnipeg for the later half of the week with mostly sunny skies. Looking to the weekend, Winnipeg will see variable cloudiness with temperatures continuing on the cooler side of seasonal.

Today’s seasonal daytime high in Winnipeg is 22°C while the seasonal overnight low is 9°C.

Pleasant Start to the Weekend, Rainy End

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After unsettled weather moves through this morning, Winnipeg will enjoy a pleasant start to the weekend. On Sunday, unsettled weather will return as the next disturbance moves into the province.

Today will start with a cold front pushing through the region early this morning. As it moves through, it will push a line of showers and thunderstorms southeastwards across the region. Behind them, skies will clear and northwesterly winds will strengthen into the 30–40 km/h range for the rest of the day. These winds will usher in a return to seasonal temperatures and Winnipeg will see a high of just 22 °C this afternoon.

A ridge of high pressure moving into the province will bring cooler temperatures into the province tonight. Winnipeg will see a low near 10 °C under clear skies with winds gradually easing.

That ridge will also give Winnipeg plenty of sunshine on Saturday. With light winds and mainly sunny skies, the city will see temperatures climb to around 23 or 24 °C. Heading into Saturday night, an approaching complex of low pressure will strengthen southeast winds into the 20–30 km/h range. These winds will help keep temperatures a bit milder with a low near 13 °C.

On Sunday, the approaching disturbance will spread cloud into the region as temperatures climb to a high near 23 °C. Forecasts show a broad area of rain developing in the afternoon, producing widespread amounts of 10–25 mm of rain across the Red River Valley by the time it tapers off overnight. Locally higher amounts may end up possible depending on how much elevated instability develops over the region.

NAM 24hr. Precipitation Accumulation Forecast valid 12Z Monday August 31, 2020
Much of southern Manitoba is forecast to see accumulating rainfall on Sunday afternoon and night.

Along with the rain, it will be a breezy day as well. The southeasterly winds will persist through the day before switching to the northwest in the evening behind a passing cold front.

Temperatures will dip to a low near 11 °C on Sunday night under mostly cloudy skies as the rain tapers off.

Long Range Outlook

Next week looks to bring a spell of seasonably cool weather. Winnipeg will see mixed skies through the week with daytime highs in the upper teens or low 20s. Overnight lows look to hover near a seasonal 10 °C. Some rain is possible mid-week as a couple disturbances are forecast to move through southern Manitoba.

Today’s seasonal daytime high in Winnipeg is 23 °C while the seasonal overnight low is 10 °C.

A Return to Seasonal Temperatures

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A large-scale pattern change will bring an end to the prolonged summer heat alongside cloudier conditions.

Winnipeg will see a cloudy start to the day with northwest winds around 20 km/h. After a cloudy morning, the sun should make an appearance for the afternoon, helping it warm up to a high near 25 °C. Winds will diminish tonight as an area of high pressure builds across the province. The city should see a low near 11 °C under clear skies.

On Thursday, Winnipeg will enjoy a sunny start to the day, but an approaching low will begin to spread cloud into the region in the afternoon. Temperatures will reach a seasonal high near 24 °C. On Thursday night, the Saskatchewan low will push into Manitoba. Its arrival will keep skies mostly cloudy through the night and bring rain through WestMan and the Interlake. For Winnipeg and the RRV, it will bring a chance of showers after midnight. Temperatures will dip to a low near 15 °C.

RDPS 12hr. Precipitation Accumulation Forecast valid 12Z Friday August 28, 2020
A low pressure system crossing the province on Friday night will bring rain across the Interlake and showers to southern Manitoba.

On Friday, a few showers are likely in the morning as a cold front pushes through the region. In its wake, northwest winds will strengthen to 30 gusting 50 km/h as skies clear. It will mark a return to seasonal temperatures in Winnipeg with a high near 22°C. Temperatures will dip to a low near 11 °C on Friday night with the winds easing off.

Long Range Outlook

The weekend will bring a mixed bag to the region with near seasonal temperatures. Winnipeg will see highs in the low to mid-20s both days with overnight lows of 10–15 °C. Saturday should bring mainly sunny skies to the region, but another low moving through on Sunday may bring rain and/or thunderstorms to the region into Monday. Next week will bring variable cloudiness and highs near 20 °C.

Today’s seasonal daytime high in Winnipeg is 23 °C while the seasonal overnight low is 10 °C.

Summer Warmth Continues

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Winnipeg will see summer warmth continue through the first half of the week followed by a return to more seasonal temperatures.

Winnipeg will see mainly sunny skies today courtesy a ridge that extends south through Manitoba from a high near the 60th parallel. With light winds, temperatures will climb to a high near 29 °C this afternoon. Along with the warmth, humidity levels will stay comfortable and make for a beautiful afternoon. Temperatures will dip to a low near 15 °C tonight with clear skies.

On Tuesday, temperatures will again climb to a high near 29 °C but a warm front will spread cloud into the region through the day. There will be a chance of scattered showers as the warm front passes midday, and again as a cold front sweeps southeast on Tuesday night. After the warm front pushes through, winds will increase out of the southeast to 30–40 km/h for the afternoon. The winds will ease after midnight, then pick up out of the northwest with the cold front early Wednesday morning.

RDPS 2m Temperature Forecast valid 21Z Tuesday August 25, 2020
Winnipeg will see another warm day on Tuesday before cooler, more seasonal temperatures move in for the second half of the week.

With both the warm and cold fronts, there will be a chance of a thunderstorms. The environment will not likely support a widespread severe weather threat, but isolated severe thunderstorms may be possible. If any severe thunderstorms develop, the primary threat associated with them would be large hail and damaging wind gusts. For any thunderstorms at night, the primary threat will be hail.

On Wednesday, northwest winds will persist at 20–30 km/h through the day and usher in more seasonal temperatures. Skies will be on the cloudier side through the morning, but should clear out for the afternoon. Winnipeg will see a high near 25 °C in the afternoon and a low near 13 °C on Wednesday night.

Long Range Outlook

A cooler air mass will move into the region for the second half of the week. Winnipeg will see highs cool to the low 20s and lows to the mid- to low teens. Skies will be variably cloudy through the second half of the week with another chance for showers or thunderstorms later Thursday.

Today’s seasonal daytime high in Winnipeg is 23°C while the seasonal overnight low is 10°C.