Ottawa Weather in September

Mild and comfortable, with occasional showers. Average highs of 21°C and lows of 13°C, with around 9 rainy days expected throughout the month.

While September isn't our top-rated month for Ottawa, it has its own appeal — typically lower prices, fewer crowds, and a more local feel.

Average high

21°C

Average low

13°C

Rainy days

9 days

Best months to visit

July, August

What to do in Ottawa in September

Whatever the weather, Ottawa rewards curious visitors. Here are some of the best ways to spend your time:

Tour the Parliament Buildings and grounds Skate the Rideau Canal in winter—world's longest skating rink Bike the Rideau Canal Pathway alongside the waterway Visit world-class museums (Canadian History, Art, Nature) Explore the ByWard Market for local food Hike trails in the Gatineau Hills north of the city

What to pack for September

Light layers work well — T-shirts and shorts for the day, a light jacket for evenings. Comfortable walking shoes are a must. Bring a compact umbrella just in case.