Ottawa Weather: Rainfall warning in effect

A rain warning remains in effect for the city of Ottawa, with Environment Canada warning that the capital could see an additional 50mm of rain by Monday evening.

A series of storms moving through the region brought driving rain, high winds and thunder to Ottawa on Sunday.

“The rain will continue intermittently today before ending late tonight.” the weather agency said in an update Monday. “Some localities have already received more than 100 mm from yesterday.”

Several roads were flooded in residential areas of Kanata and other parts of the city, and Hydro Ottawa responded to several power outages. At one point, more than 2,000 customers were without power.

The updated rain warning says rain amounts of 50-100mm of rain are expected by Monday evening.

Environment Canada says water can pool on roads and cause localized flooding in low-lying areas.

A heat warning has ended, with cooler temperatures expected on Monday.

Monday will be cloudy with a chance of showers in the morning. Showers beginning in the afternoon. Amount 5 to 10 mm. High 27 C, with the Humidex feeling like 37 degrees.

On Sunday, Ottawa reached 30°C with a 12-hour 41 Humidex. The temperature dropped slightly just after 1 p.m. as a thunderstorm passed.

The August 7 record at the Ottawa airport was 34.2°C, set in 2001. The precipitation record is 53.1 mm, set in 1972. The average maximum for this time of year is 26°C.

The forecast calls for occasional heavy showers that will continue throughout the evening and night. Local upright 30 to 40 mm. Low 19C.

Tuesday’s forecast calls for more rain with a high of 21°C. Wednesday could see some sunny breaks.


Saturday says a high of 32.2 C in Ottawa, making it the hottest day of 2022 so far. Humidex was 41, also the wettest it has been this year.

“It’s very unhealthy, very uncomfortable. It doesn’t matter if you’re fit or athletic,” Environment Canada senior climatologist David Phillips said. “It’s tropical air. It’s moisture from the Gulf of Mexico and the Atlantic Ocean often called the Bermuda High, pumping all that warm air north like a heat pump. Much of the eastern part of the country and millions of Canadians are going to be affected by this.”

Gatineau was the hot spot in Canada at 6 p.m. Saturday.

The temperature at the Gatineau airport was 32.5 C.

The hottest temperature in Gatineau on Saturday was 32.7 C at 5 p.m.

–With files from Jackie Perez of CTV News Ottawa.

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