Weather in September in Ontario
Considering a trip to Ontario this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:
What is the weather like in Ontario in September?
Ontario is a region in Canada. September in Ontario generally has temperatures that range from mild to warm, with precipitation levels ranging from moderate to high. During September, summer is in full swing.
Temperatures
During the day temperatures vary from mild in Niagara on the Lake at 17°C to warm in Chatham at 24°C. At night it cools down to 14°C in Chatham and 9°C in Niagara on the Lake.To learn more about the conditions in specific areas of Ontario, check out the map below.
Precipitation
In September, precipitation varies across different areas. From moderate rainfall in Niagara on the Lake with an average of 60 mm to high rainfall in Schreiber with 127 mm.Average sunshine
The city Toronto usually sees around 195 hours of sunlight, indicating many sunny days.For an in-depth overview of the yearly conditions, do visit our Ontario climate page.
Where to go in Ontario in September
perfect weather
pleasant
tolerable
unpleasant
poor
Select a Month of Interest
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Ontario's climate page.
Popular destinations
What is the weather like in September for the 5 most popular destinations in Ontario?
Toronto
In September Toronto generally has high temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 15°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Ottawa
In September Ottawa generally has high temperatures with maximum daytime temperatures around 22°C, minimum nighttime temperatures around 10°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Niagara Falls
In September Niagara Falls generally has high temperatures with maximum daytime temperatures around 23°C, minimum nighttime temperatures around 13°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Mississauga
In September Mississauga generally has high temperatures with maximum daytime temperatures around 23°C, minimum nighttime temperatures around 13°C and moderate monthly rainfall. So on average the conditions are perfect that month.
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Niagara on the Lake
In September Niagara on the Lake generally has moderate temperatures with maximum daytime temperatures around 17°C, minimum nighttime temperatures around 9°C and moderate monthly rainfall. So on average the conditions are tolerable that month.
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Is your destination not in the list? Have a look at other destinations in Ontario, in Canada.
Is September the best time to visit Ontario?
We consider September to be one of the best times to travel to Ontario. Typically, the climate in Toronto is perfect. However, the weather conditions may vary depending on your destination.
Generally speaking, the best visiting conditions can be found in June, July, August and September offering mostly perfect weather in Toronto. The weather in January, February, March, April, November and December, on the other hand, tends to be poor.
Interested in more climate information?
We have much more information about the climate in Ontario.
Weather and climate has detailed information for every country in the world. Are you going to Canada? Get detailed 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.