Ottawa weather in September (Ontario, Canada)

How does the weather in Ottawa usually fare in September? Find all the essential weather information for this month in our guide.

Temperatures

The weather in Ottawa is usually perfect in September, featuring high temperatures and moderate rainfall. In the daytime, temperatures tend to hover near 22°C, cooling down at night to around 10°C.

Precipitation

Ottawa in September usually receives moderate rainfall, averaging around 99 mm for the month. On average, there are about 12 days with rain during this month.

Average sunshine

The month brings about 178 hours of sunlight, offering a comfortable mix of sun and shade.

If you favor pleasant temperatures and minimal rainfall, September is one of the better months to visit Ottawa. May, August and September typically offer the most agreeable circumstances. On the other hand, January, February, March, November and December tend to be characterized by conditions that may not be as optimal.

For an in-depth look at the yearly conditions, visit our specialized Ottawa climate page with graphs.

 

Ottawa, monthly averages in September

Min Temperature 10°C  

Max Temperature 22°C  

Chance of Rain 40%  

Precipitation 99 mm  

Rainy days 12 days  

Humidity 59%  

Sunshine 178 hours  

Percentage Sunshine 47%  

Where to go in Canada in September

Find out more about the weather in Canada and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Ottawa, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

4/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Ottawa.

Our site offers climate and forecast data for every country in the world. Are you going to Canada? On this website you can find historical weather averages for many cities in Canada. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.