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
Reference

Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.

Ontario Precipitation
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