Average data for 10 years
1 May
Wednesday
+23°
+18°
2 May
Thursday
+24°
+18°
3 May
Friday
+22°
+16°
4 May
Saturday
+19°
+13°
5 May
Sunday
+18°
+13°
6 May
Monday
+17°
+13°
7 May
Tuesday
+18°
+13°
8 May
Wednesday
+17°
+14°
9 May
Thursday
+19°
+14°
10 May
Friday
+21°
+16°
11 May
Saturday
+22°
+17°
12 May
Sunday
+22°
+17°
13 May
Monday
+22°
+16°
14 May
Tuesday
+21°
+16°
15 May
Wednesday
+21°
+16°
16 May
Thursday
+20°
+16°
17 May
Friday
+21°
+15°
18 May
Saturday
+22°
+17°
19 May
Sunday
+23°
+17°
20 May
Monday
+21°
+15°
21 May
Tuesday
+19°
+14°
22 May
Wednesday
+18°
+14°
23 May
Thursday
+18°
+13°
24 May
Friday
+18°
+13°
25 May
Saturday
+18°
+13°
26 May
Sunday
+20°
+15°
27 May
Monday
+21°
+15°
28 May
Tuesday
+22°
+16°
29 May
Wednesday
+22°
+17°
30 May
Thursday
+22°
+17°
31 May
Friday
+23°
+17°
In May, the weather in Ontario is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Ontario has 28 sunny and 3 partly cloudy days in May. May as well as June and October is considered the most comfortable time to visit Ontario.