Toronto

Ontario Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Ontario, Canada in September.

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Toronto Ottawa Niagara Falls Mississauga

Considering a trip to Ontario, Canada this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Ontario in September

Ontario, Canada 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 (63°F) to warm in Chatham at 24°C (75°F). At night it cools down to 14°C (57°F) in Chatham and 9°C (48°F) in Niagara on the Lake.

To learn more about the conditions in specific areas of Ontario, Canada, 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 (2.4 in) to high rainfall in Schreiber with 127 mm (5 in).

Average sunshine

Many locations offer abundant sunshine during this month. For instance, Toronto enjoys approximately 195 hours of sunlight, ideal for those seeking sunny weather.

Explore Ontario by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Best Places to Visit in Ontario in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Ontario.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Ontario

What is the weather like in September for some of the most popular destinations in Ontario, Canada?

Temperature range in Ontario (September)

Precipitation variation in Ontario (September)

Toronto

In September Toronto generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 15°C (59°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
22°C (72°F)
16°C (61°F)
Min temperature
18°C (64°F)
15°C (59°F)
8°C (46°F)
Monthly sun hours
245 hours
195 hours
160 hours
Monthly rainfall
68 mm (2.7 in)
83 mm (3.3 in)
91 mm (3.6 in)
Monthly rainy days
10 days
10 days
11 days
Weather conditions
perfect
perfect
tolerable
Climate in Toronto →

Ottawa

In September Ottawa generally has high temperatures with maximum daytime temperatures around 22°C (72°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
22°C (72°F)
14°C (57°F)
Min temperature
14°C (57°F)
10°C (50°F)
4°C (39°F)
Monthly sun hours
251 hours
178 hours
138 hours
Monthly rainfall
94 mm (3.7 in)
99 mm (3.9 in)
102 mm (4 in)
Monthly rainy days
11 days
12 days
12 days
Weather conditions
perfect
perfect
unpleasant
Climate in Ottawa →

Niagara Falls

In September Niagara Falls generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
23°C (73°F)
15°C (59°F)
Min temperature
17°C (63°F)
13°C (55°F)
7°C (45°F)
Monthly sun hours
268 hours
206 hours
158 hours
Monthly rainfall
67 mm (2.6 in)
86 mm (3.4 in)
103 mm (4.1 in)
Monthly rainy days
11 days
12 days
15 days
Weather conditions
perfect
perfect
unpleasant
Climate in Niagara Falls →

Mississauga

In September Mississauga generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 13°C (55°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
23°C (73°F)
15°C (59°F)
Min temperature
17°C (63°F)
13°C (55°F)
7°C (45°F)
Monthly sun hours
276 hours
216 hours
165 hours
Monthly rainfall
69 mm (2.7 in)
80 mm (3.1 in)
86 mm (3.4 in)
Monthly rainy days
9 days
9 days
10 days
Weather conditions
perfect
perfect
tolerable
Climate in Mississauga →

Niagara on the Lake

In September Niagara on the Lake generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 9°C (48°F) and moderate monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
20°C (68°F)
17°C (63°F)
12°C (54°F)
Min temperature
12°C (54°F)
9°C (48°F)
5°C (41°F)
Monthly sun hours
268 hours
206 hours
158 hours
Monthly rainfall
47 mm (1.9 in)
60 mm (2.4 in)
64 mm (2.5 in)
Monthly rainy days
8 days
9 days
11 days
Weather conditions
perfect
tolerable
unpleasant
Climate in Niagara on the Lake →

Is your destination not in the list? Have a look at all destinations in Ontario, in Canada.

Popular cities in September

Day & night temperatures, rainfall and average weather in Ontario in September.

City Weather Day temp Night temp Rainfall
Toronto 22°C (72°F) 15°C (59°F) 83 mm (3.3 in)
Ottawa 22°C (72°F) 10°C (50°F) 99 mm (3.9 in)
Niagara Falls 23°C (73°F) 13°C (55°F) 86 mm (3.4 in)
Mississauga 23°C (73°F) 13°C (55°F) 80 mm (3.1 in)
Niagara on the Lake 17°C (63°F) 9°C (48°F) 60 mm (2.4 in)
Kingston 22°C (72°F) 14°C (57°F) 102 mm (4 in)

Ontario weather in September: frequently asked questions

What is the weather like in Ontario, Canada in September?

September in Ontario, Canada brings perfect weather. In Toronto, daytime temperatures are typically around 22°C (72°F) and nighttime lows hover near 15°C (59°F).

What is the average temperature in Ontario, Canada in September?

Average temperatures in Ontario, Canada during September range from a nighttime low near 15°C (59°F) to a daytime high around 22°C (72°F) in Toronto.

Does Ontario, Canada get a lot of rain in September?

Rain is generally moderate to light in Ontario, Canada during September, with Toronto averaging close to 83 mm (3.3 in).

Is September a Good Time to Visit Ontario, Canada?

We consider September to be one of the best times to travel to Ontario, Canada. 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.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

Visit Algonquin Park

Algonquin park is one of the best places to experience the Canadian wilderness and learn more about the nation’s cultural history. It is open year round and offers a variety of activities depending on the season.
Canoeing the south Nahannii

The South Nahanni in the northwest of Canada is one of the most impressive wilderness rivers in the world. Canoeing the south Nahanni is something you must add to your bucket list.
See Polar Bears in Churchill Canada

Thousands of bears gather at the small town of Churchill. In the evening the northern lights give a light show against the dark evening sky. An unforgettable experience.
Banff National Park

Snowy mountains, clear blue lakes and green forests make Banff National Park a wonderful bucket list destination. The pristine wilderness is a mecca for walkers.
Must visit in Canada →