Thunder Bay weather in September (Ontario, Canada)

How does the September weather in Thunder Bay compare to other months? Find all the essential weather information for this month in our guide.

Temperatures

In September, the weather in Thunder Bay generally includes pleasant temperatures and moderate rainfall. During September, you’ll experience the summer season. During the day, temperatures can climb to about 18°C. At night, they may fall to a cooler 10°C.

Precipitation

Thunder Bay in September usually receives moderate rainfall, averaging around 93 mm for the month. It's the month with the heaviest rainfall, so an umbrella is a must to navigate the wet weather. This month experiences about 13 days of rain according to historical data.

In case you lean more towards enjoying temperate temperatures and rain-free days July and August typically offer the most optimal weather. In contrast, January, February, March, April, November and December tend to have less optimal conditions.

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

 

Thunder Bay, monthly averages in September

Min Temperature 10°C  

Max Temperature 18°C  

Chance of Rain 43%  

Precipitation 93 mm  

Rainy days 13 days  

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 Thunder Bay, 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.

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

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

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.