Environment Canada warning: Heavy rain on the way in Ottawa

A pedestrian walks during a rainstorm in the ByWard Market on Sunday, July 6, 2025. (Brad Quinn/CTV News Ottawa)

Environment Canada has issued a yellow warning — rainfall to warn of heavy rain in the Ottawa area this weekend.

According to Environment Canada’s warning statement, residents should expect 20 to 40 millimetres of rain beginning Saturday afternoon and continuing through Sunday morning.

“A Colorado low will bring rain to the area, beginning with periods of rain this afternoon. The heaviest rain is expected to fall this evening and tonight, with locally higher amounts possible in thunderstorms,” Environment Canada said.

Environment Canada says the ground may be unable to absorb more moisture due to recent rainfall.

“Water will likely pool on roads and in low-lying areas. Visibility will likely be suddenly reduced at times,” Environment Canada wrote. “Avoid low-lying areas. Watch for washouts near rivers, creeks and culverts.”

Warnings are in effect through much of eastern Ontario, and Environment Canada has issued orange warnings for some areas in western Quebec and northeastern Ontario.

Forecast

In addition to the rain, those in Ottawa can expect a temperature high of 6 C on Saturday.

• Hourly and 7-day forecast on our CTVNewsOttawa.ca weather hub

On Sunday, expect a temperature high of 10 C and a 40 per cent chance of showers.

Monday’s forecast predicts temperatures around 4 C with a mix of sun and clouds.

On Tuesday, expect a high of 1 C with a 30 per cent chance of flurries.

• Sign up now for daily CTV News Ottawa newsletters
• The information you need to know, sent directly to you: Download the CTV News App