Average Rainfall for Ontario in August

The tables below lists monthly averages for rainfall during August at cities, towns and parks in Ontario. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation.

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

The calculation of days only includes the days when precipitation totalled at least 0.2 millimetres (0.008 inches). The month's rainfall numbers are averages of weather data collected during 1981 to 2010.

Eastern Ontario

Average monthly precipitation in August
Days	Place	Inches	Millimetres
11	Belleville	3.0	75
11	Cornwall	3.5	89
11	Kingston	3.7	94
11	Ottawa	3.3	84
13	Pembroke	3.3	83

Central Ontario

August averages for total rainfall
Days	Place	Inches	Millimetres
12	Barrie	3.5	90
10	Brantford	3.0	75
10	French River, Chaudiere Dam	3.1	79
11	Hamilton	3.5	90
13	Huntsville	3.2	81
12	Midland	3.1	78
12	Niagara Falls	3.1	78
11	Oshawa	3.0	77
12	Peterborough	3.8	96
10	St Catharines	2.8	70
10	Toronto	3.2	81

Southwestern Ontario

Average amount of rain in August
Days	Place	Inches	Millimetres
10	Chatham-Kent	3.1	79
13	Guelph	3.7	93
10	London	3.3	83
12	Owen Sound	3.1	79
10	Point Pelee National Park	3.4	86
10	Sarnia	3.1	79
11	Waterloo	3.3	84
10	Windsor	2.9	73

Northeastern Ontario

Precipitation totals for August
Days	Place	Inches	Millimetres
15	Chapleau	3.0	76
11	Gore Bay	2.6	65
15	Kapuskasing	3.0	77
15	Moosonee	3.1	78
12	North Bay	3.6	91
12	Sault Ste Marie	3.3	83
11	South Baymouth	2.9	74
12	Sudbury	3.4	85
14	Timmins	3.2	82
13	Wawa	3.6	93

Northwestern Ontario

Total precipitation during August
Days	Place	Inches	Millimetres
12	Atikokan	3.5	88
14	Big Trout Lake	3.5	89
12	Dryden	3.3	84
12	Fort Frances	3.6	92
12	Kenora	3.3	84
14	Red Lake	3.5	88
12	Thunder Bay	3.5	89