Frost advisory issued for Ottawa

The Peace tower is framed between tulips on Parliament Hill, in Ottawa, on Monday, May 11, 2026. THE CANADIAN PRESS/Adrian Wyld

It’s a cold start to the work week in Ottawa, with below-seasonal temperatures and the risk of frost.

Environment Canada has issued a Yellow Advisory – Frost for Ottawa and eastern Ontario, with temperatures expected to drop to 0 C tonight.

“Frost may damage some crops in frost-prone areas,” the weather agency said.

“Patchy frost is expected overnight and into early Tuesday morning. Damage to plants, trees, and crops is possible.”

Below-seasonal temperatures are expected in Ottawa over the next four days, with highs of 12 C today and 13 C on Tuesday and Wednesday.

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

The normal temperatures for this time of year are a high of 19 C and a low of 8 C.

Environment Canada’s forecast calls for a mix of sun and cloud today with a 60 per cent chance of afternoon showers. High 12 C.

It will be partly cloudy tonight with a 30 per cent chance of evening showers. Low 0 C.

Tuesday will see sunshine. High 13 C.

Rain is expected on Wednesday. High 13 C.

The outlook for Thursday calls for mainly cloudy with a 40 per cent chance of showers. High 16 C.

A mix of sun and cloud is in the forecast for Friday. High 19 C.

The normal temperatures for this time of year are a high of 19 C and a low of 8 C.

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