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Ottawa

10-20 mm of rain, risk of thunderstorm in the forecast Sunday

Updated: 

Published: 

The full local 6 p.m. forecast for Saturday, March 15, 2025.

Environment Canada has lifted a special weather statement that was in effect for Ottawa as 10-20 millimeters of rain and thunderstorms moved through the region on Sunday.

As of 3:30 p.m., 4-5 mm of rain had been recorded at the Ottawa International Airport. Scattered showers are expected to taper off tonight.

The statement had warned of localized flooding in low-lying areas.

Ottawa police have issued several road closures in Ottawa’s rural west end due to flooding, including Ottawa Road 29 and Ritchie Side Road.

A flood watch for the North Gower area was issued this weekend by the Rideau Valley Conservation Authority (RVCA).

“There is going to be elevated water levels as well as the elevated flows,” said Isabelle Maltais, director of watershed science and engineering at the RVCA. “So, we ask the residents to be cautious.”

The flood safety warning system consists of four levels of alerts: water safety, flood outlook, flood watch and flood warning.

At this time, a lower-level flood outlook has been issued for the Rideau River and any bodies of water branching off of it. Both the flood watch and flood outlook are in effect until March 18.

The South Nation Conservation has also issued a flood watch for this weekend and the Mississippi Valley Conservation Authority has issued a flood outlook.

For information and details about floods, visit Ontario.ca/floods.

Weather forecast

The weather agency calls for showers ending this evening then mainly cloudy with a 30 percent chance of showers. There is a risk of a thunderstorms early this evening.

A low of -2 C with wind becoming light after midnight is expected.

Monday will see a high of 3 C and mainly cloudy skies. A low of -8 C and clear skies are anticipated overnight.

On Tuesday, the capital will see a high of 9 C and clear skies. A low of 1 C and clear skies are expected overnight.

The normal temperatures for this time of year are a high of 3 C and a low of -6 C.

Record-breaking temperatures

Ottawa hit record-breaking temperatures on Saturday, giving residents a taste of spring leading up to St. Patrick’s Day.

The temperature hit 14.8 C at the Ottawa International Airport at 3 p.m., the warmest temperature recorded so far this year.

It’s also the hottest March 15 since record-keeping began at the airport in 1939.

The previous record was 14.3 C set in 2010.

Temperatures are only expected to get warmer, with Environment Canada predicting a high of 18 C on Sunday.

With files from CTV News Ottawa’s Dylan Dyson and William Etherington