S
M
T
W
T
F
S
31
74°
42°
1
76°
44°
2
76°
46°
3
78°
44°
4
82°
48°
5
83°
52°
6
80°
64°
7
83°
61°
8
86°
55°
9
82°
69°
10
85°
71°
11
87°
69°
12
80°
62°
13
82°
57°
14
81°
58°
15
69°
50°
16
74°
58°
17
80°
68°
18
85°
58°
19
77°
54°
20
77°
56°
21
74°
62°
22
74°
55°
23
77°
56°
24
78°
57°
25
79°
59°
26
81°
60°
27
82°
63°
28
81°
62°
29
83°
61°
30
77°
58°
1
78°
57°
2
79°
64°
3
79°
62°
4
80°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Ontario
Ontario's June 2026 forecast shows daily high temperatures ranging from 74° to 85°, with overnight lows between 54° and 68°. The average high for June is 79° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Ontario. See also: July | August | September.
