Hot and sticky conditions expected in Ottawa as humidex soars
Posted Jun 8, 2026 01:07:44 PM.
Last Updated Jun 9, 2026 08:55:06 AM.
Residents in the nation’s capital got a taste of the humidity late last week, but that will pale in comparison to what’s in store later this week in the city.
The week kicked off with seasonal temperatures, but the heat and humidity will move into the area, peaking mid-to late-week, with humidex values in the high 30s.
“We’re back into the summer-like heat and humidity beginning Wednesday…It’s going to be feeling quite uncomfortable at times, especially by Thursday, as this humidity really starts to peak,” said CityNews meteorologist Jessie Uppal.
The high for Tuesday is 30 C but the humidex will start to rise, feeling closer to 32.
Uppal said Wednesday is expected to be very muggy as the humidity brings the temperature from 22 C to 29. It is expected to remain hot and sticky on Thursday with a high of 28 C and the highest humidex of the week near 38.
With the humidity comes the return of wet weather. Uppal said this is especially the case for Tuesday as the forecast calls for isolated showers and a risk of thunderstorms that will linger on and off through the evening and overnight.
“Temperatures are actually going to be quite warm and uncomfortable, likely hovering between 18 to about 20 C. And that will continue Tuesday night, Wednesday night, and again, Thursday night. So very little in terms of relief from the hot, sticky conditions,” she said.
Uppal said there is also a chance for some on and off wet weather on Wednesday and Thursday, with a risk of some isolated thunderstorms.
The humidity will ease off slightly by Friday evening but humidex values will still remain in the high 20s.
Although the official start of summer is later in June, Ottawa has already seen above-seasonal temperatures this month. Summer officially arrives at 4:24 a.m. ET on June 21.
Last week, CityNews Chief Meteorologist Natasha Ramsahai released her outlook for the upcoming summer, saying it is looking to be to potentially wetter and cooler than average for the season.
She said that does not mean Ontario will not get any warms day, but rather, cooler-than-average conditions and “more ‘interruptions’ reducing the chances for very long heat waves.”
