September Temperatures in Ontario

Average temperatures for September at cities, towns and parks throughout Ontario are given below.

You can jump to a separate table for each section of the province: Eastern, Central, Southwestern, Northeastern and Northwestern Ontario.

The tables list the normals for maximum and minimum monthly temperatures, in degrees Celsius and Fahrenheit, based on weather data collected from 1981 to 2010.

Eastern Ontario

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
70	53	Belleville	21	12
70	52	Cornwall	21	11
67	51	Kingston	20	11
69	50	Ottawa	20	10
67	43	Pembroke	19	6

Central Ontario

Average daily temperatures in September
High °F	Low °F	Place	High °C	Low °C
69	50	Barrie	21	10
71	50	Brantford	22	10
66	46	French River, Chaudiere Dam	19	8
70	52	Hamilton	21	11
66	48	Huntsville	19	9
68	48	Midland	20	9
70	54	Niagara Falls	21	12
68	53	Oshawa	20	12
68	50	Peterborough	20	10
71	53	St Catharines	22	12
70	56	Toronto	21	13

Southwestern Ontario

September temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
73	55	Chatham-Kent	23	13
68	47	Guelph	20	8
70	50	London	21	10
68	52	Owen Sound	20	11
71	56	Point Pelee National Park	22	14
71	52	Sarnia	22	11
69	48	Waterloo	20	9
73	55	Windsor	23	13

Northeastern Ontario

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
62	42	Chapleau	17	6
65	49	Gore Bay	18	10
62	42	Kapuskasing	17	5
60	41	Moosonee	16	5
64	47	North Bay	18	8
66	46	Sault Ste Marie	19	8
63	49	South Baymouth	17	10
64	46	Sudbury	18	8
63	41	Timmins	17	5
62	43	Wawa	17	6

Northwestern Ontario

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
64	45	Atikokan	18	7
54	40	Big Trout Lake	12	5
62	44	Dryden	17	7
65	44	Fort Frances	18	7
63	47	Kenora	17	8
61	43	Red Lake	16	6
64	42	Thunder Bay	18	6

Average Temperatures for Ontario in September

Eastern Ontario

Central Ontario

Southwestern Ontario

Northeastern Ontario

Northwestern Ontario

Reference

More Ontario Weather Information