August Temperatures in Ontario

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

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

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 August temperatures
High °F	Low °F	Place	High °C	Low °C
78	61	Belleville	26	16
78	60	Cornwall	26	16
75	59	Kingston	24	15
78	58	Ottawa	25	14
76	51	Pembroke	25	11

Central Ontario

Average daily temperatures in August
High °F	Low °F	Place	High °C	Low °C
77	58	Barrie	25	14
78	58	Brantford	26	14
76	55	French River, Chaudiere Dam	25	13
79	60	Hamilton	26	16
75	56	Huntsville	24	13
77	56	Midland	25	13
79	62	Niagara Falls	26	17
76	60	Oshawa	24	16
77	58	Peterborough	25	14
78	60	St Catharines	26	16
78	63	Toronto	26	17

Southwestern Ontario

August temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
80	62	Chatham-Kent	26	17
76	55	Guelph	24	13
78	57	London	25	14
75	59	Owen Sound	24	15
78	63	Point Pelee National Park	26	17
77	59	Sarnia	25	15
77	55	Waterloo	25	13
80	63	Windsor	27	17

Northeastern Ontario

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
71	50	Chapleau	22	10
75	57	Gore Bay	24	14
72	49	Kapuskasing	22	10
70	47	Moosonee	21	9
73	55	North Bay	23	13
74	53	Sault Ste Marie	23	12
73	56	South Baymouth	23	13
74	54	Sudbury	23	12
73	49	Timmins	23	9
70	50	Wawa	21	10

Northwestern Ontario

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
75	55	Atikokan	24	13
68	51	Big Trout Lake	20	11
74	54	Dryden	23	12
75	52	Fort Frances	24	11
74	57	Kenora	23	14
73	52	Red Lake	23	11
74	51	Thunder Bay	23	10

Average Temperatures for Ontario in August

Eastern Ontario

Central Ontario

Southwestern Ontario

Northeastern Ontario

Northwestern Ontario

Reference

More Ontario Weather Information