Thunderstorms are possible as the heat wave continues in southwestern Ontario, while Manitoba residents can expect a shift in weather patterns heading into the weekend. Colleen Bready provides the current conditions and updated weather forecast for July 3, 2026.
Current Conditions and Heat Wave Update
Parts of Manitoba and Ontario have been experiencing a prolonged heat wave, with temperatures soaring above seasonal norms. In southwestern Ontario, the heat warning remains in effect, though some areas have seen warnings lifted as the region adjusts to the heat. Thunderstorms are forecast to develop later today and into the weekend, bringing a risk of heavy rain, lightning, and gusty winds.
In Manitoba, the heat is expected to persist into Friday before a cold front moves in, bringing cooler temperatures and a chance of thunderstorms Saturday and Sunday. The shift will provide relief from the oppressive heat but may also introduce severe weather risks, including localized flooding and strong winds.
Weekend Forecast for Manitoba
For the weekend of July 4-5, 2026, Manitoba's weather will be characterized by a transition from hot and humid conditions to cooler and unsettled patterns. Saturday will see a mix of sun and clouds with a 40% chance of thunderstorms in the afternoon, particularly in the southern regions including Winnipeg. Highs will reach around 28°C, dropping from the mid-30s earlier in the week.
Sunday will be mostly cloudy with a 60% chance of showers or thunderstorms, especially in the morning and evening. Temperatures will be near seasonal norms, with highs around 24°C. The cooler air will provide relief for residents who have endured several days of extreme heat.
Impacts and Precautions
The heat wave has already led to health concerns, with several heat-related illnesses reported. Health officials advise residents to stay hydrated, avoid strenuous outdoor activities during peak heat, and check on vulnerable individuals. The upcoming thunderstorms could cause power outages, localized flooding, and hazardous driving conditions.
According to Environment Canada, the storm risk will be highest in areas that have experienced the most intense heat, as the clash of hot and cold air masses can trigger severe thunderstorms. Residents are urged to monitor weather alerts and be prepared for sudden changes.
Regional Weather Highlights
Elsewhere in Canada, heat warnings continue to grip parts of the country as a death toll mounts in Europe from extreme temperatures. In Quebec and Ontario, severe storms have left 55,000 hydro clients without power. Meanwhile, wildfires are burning in British Columbia, including an evacuation alert near Boston Bar. The varied weather across Canada underscores the need for vigilance as summer conditions intensify.
