A prolonged stretch of hot, humid weather has prompted heat warnings across much of southern Manitoba, with humidex values expected to climb into the low 40s and the sweltering conditions likely to continue into early August.
“We have heat warnings out for southern Manitoba, from the Red River Valley stretching westward to Westman and southern Saskatchewan,” says Brian Proctor, a meteorologist with Environment and Climate Change Canada (EC). “We don’t get much up into the Interlake area at all.”
The Whiteshell Provincial Park area in southeast Manitoba is also not under the warning.
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“The heat will definitely be the big player in weather for us this week. It’s really not the temperature so much as it is the humidity more than anything.”
Humidex levels are expected to reach the high 30s and low 40s throughout the week, including 37 degrees in Winnipeg Monday afternoon.
“Really warm, muggy, messy conditions across much of southern Manitoba this week. We’re not seeing a ton of smoke right now either, so that’s not limiting the daytime heating.”
Heat warning in southern Manitoba on July 27, 2026. (EC website)
Sporadic storms with the heat
While most of the days aren’t calling for a large amount of rain and will be mostly sunny, the hot, moist air makes the perfect conditions for potential thunderstorms.
“Almost every day this week, we’ll see a chance of thunderstorms or shower activity, associated with cycling all that moisture and this heat.”
The likeliest time for thunderstorms to occur is during the hottest time of the day, which is typically the late afternoon and then into the evening.
“The day we have the least chance of seeing those thunderstorms may be Wednesday. We’ll get a bit more of an upper ridge in place that suppresses things a little bit.”
As for when this heat wave will end, Proctor thinks it will continue until the second week in August, most likely.