S
M
T
W
T
F
S
31
74°
47°
1
72°
48°
2
73°
49°
3
76°
54°
4
80°
59°
5
82°
63°
6
80°
66°
7
80°
65°
8
80°
64°
9
81°
62°
10
79°
61°
11
80°
62°
12
78°
61°
13
79°
64°
14
80°
69°
15
74°
55°
16
72°
54°
17
73°
55°
18
75°
57°
19
76°
60°
20
80°
64°
21
76°
64°
22
77°
63°
23
77°
64°
24
78°
62°
25
77°
60°
26
81°
65°
27
82°
64°
28
78°
61°
29
77°
58°
30
78°
59°
1
77°
59°
2
78°
63°
3
81°
65°
4
79°
60°
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 72° to 82°, with overnight lows between 48° and 69°. The average high for June is 78° with an average low of 61°. 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.
