Average Temperatures for Ontario in May





Average temperatures for May 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 May temperatures
High °F Low °F Place High °C Low °C
66 48 Belleville 19 9
67 47 Cornwall 19 9
62 45 Kingston 16 7
66 46 Ottawa 19 8
66 40 Pembroke 19 4

Central Ontario

Average daily temperatures in May
High °F Low °F Place High °C Low °C
64 44 Barrie 18 7
67 46 Brantford 19 8
64 41 French River, Chaudiere Dam 18 5
65 46 Hamilton 19 8
64 42 Huntsville 18 6
65 42 Midland 18 6
67 48 Niagara Falls 19 9
62 46 Oshawa 17 8
66 46 Peterborough 19 8
67 46 St Catharines 19 8
65 50 Toronto 18 10

Southwestern Ontario

May temperatures: daily averages
High °F Low °F Place High °C Low °C
68 49 Chatham-Kent 20 9
65 43 Guelph 18 6
66 45 London 19 7
62 43 Owen Sound 17 6
64 49 Point Pelee National Park 18 9
65 45 Sarnia 18 7
65 44 Waterloo 18 6
69 49 Windsor 20 10

Northeastern Ontario

Average May temperatures
High °F Low °F Place High °C Low °C
61 37 Chapleau 16 3
61 42 Gore Bay 16 5
61 36 Kapuskasing 16 2
56 32 Moosonee 13 0
62 42 North Bay 17 6
62 39 Sault Ste Marie 16 4
58 41 South Baymouth 15 5
63 41 Sudbury 17 5
62 37 Timmins 17 3
58 35 Wawa 15 1

Northwestern Ontario

Average May temperatures
High °F Low °F Place High °C Low °C
62 39 Atikokan 17 4
54 31 Big Trout Lake 12 0
62 41 Dryden 17 5
64 40 Fort Frances 18 4
62 43 Kenora 17 6
61 37 Red Lake 16 3
61 36 Thunder Bay 16 2
Reference

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

Ontario Temperatures
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