Southern Manitoba Bakes Under Prolonged Heat Wave Before Late-Week Relief

WINNIPEG – WEATHER REPORT – The Heat Warning remains firmly in place for Winnipeg as southern Manitoba endures another day of blistering heat. Temperatures are set to climb to a scorching 35°C today—pushing into the danger zone for heat-related illnesses. While relief is on the horizon later in the week, residents will need to sweat through one more day of extreme heat before some showers and cooler air bring a welcome reprieve by Thursday and Friday.

Heat Wave Peaking Today Before Cooling Trend Begins

At 6:00 AM CDT, Winnipeg Richardson International Airport was already sitting at 21.2°C under partly cloudy skies. Winds are roaring in from the south at 39 km/h, gusting to 53 km/h, keeping the city hot and dry with humidity at a sparse 34%. The barometric pressure is currently 99.6 kPa and rising slightly, but no significant cool-down is expected until midweek.

Today’s forecast is simple and sizzling: sunny skies, south winds continuing at 40 km/h and gusting up to 60 km/h, and a high of 35°C. The UV index will reach 8—very high—making sunburn a real risk if you’re outdoors without protection.

Tonight will see partly cloudy skies and the beginning of a wind shift to the northeast at 30 km/h. The low will remain quite warm at 16°C, providing little relief for those without air conditioning.

Wednesday will bring a slight cooldown, with a mix of sun and cloud and a high of 30°C. Winds will ease somewhat, becoming north at 20 km/h before shifting east later in the afternoon. A humidex of 31 will keep things feeling sticky. By evening, the weather pattern will begin to change, with cloud cover increasing and a 60 percent chance of showers developing overnight. The low will dip to 14°C.

Thursday will offer more significant relief with a mix of sun and cloud and a continued 60 percent chance of showers. The high will ease to 28°C, finally bringing temperatures closer to seasonal averages. Showers are expected to continue into Thursday night, with a low of 9°C.

Friday will feel dramatically cooler and wetter, with widespread showers and a high of just 17°C. The night will continue rainy and surprisingly cold for May, with a low dipping to zero—yes, that’s right, back to the freezing mark. That’s spring in Manitoba for you—always a bit dramatic.

Heat Safety Essentials: Stay Cool and Hydrated

With one more day of intense heat, make sure to limit outdoor activities during peak heat hours, stay in shaded or air-conditioned spaces, and drink water frequently. Heat-related illnesses like heat exhaustion and heat stroke can sneak up quickly in these conditions, especially for older adults, children, and those with health conditions.

Historical Records for May 13

Winnipeg’s record high for today is 36.7°C, while the record low is -3.3°C. With today’s forecast high of 35°C, the city is once again challenging historical records—and with Friday’s forecast low potentially touching zero, this is truly a Manitoba weather roller coaster.

Winnipeg Weather Trivia

Did you know? Winnipeg holds the title for the greatest annual temperature range of any major Canadian city—from -47.8°C in winter to 42.2°C in summer. This week’s forecast is putting that reputation on full display, offering a 35°C high today and a possible freezing night by Friday. Only in Manitoba!