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