The temperatures in Ottawa in May are quite cold with temperatures between 8°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Ottawa. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Please note that Ottawa can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Ottawa in May 2025.
If you’re planning to visit Ottawa in the near future, we highly recommend that you review the 14 day weather forecast for Ottawa before you arrive.
Temperatures
18° / 8°
Rainy Days
8
Snowy Days
1
Dry Days
23
Rainfall
116
mm
Sun Hours
9.1
Hrs
