S
M
T
W
T
F
S
31
73°
55°
1
68°
54°
2
68°
48°
3
69°
50°
4
72°
48°
5
75°
51°
6
78°
46°
7
70°
50°
8
73°
50°
9
70°
52°
10
71°
56°
11
71°
55°
12
74°
61°
13
80°
62°
14
82°
61°
15
83°
61°
16
78°
59°
17
75°
56°
18
77°
59°
19
77°
61°
20
75°
63°
21
80°
63°
22
83°
64°
23
85°
63°
24
83°
64°
25
84°
61°
26
81°
55°
27
76°
56°
28
75°
60°
29
73°
64°
30
76°
65°
1
84°
65°
2
84°
64°
3
81°
60°
4
85°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in St. Catharines
St. Catharines's June 2026 forecast shows daily high temperatures ranging from 68° to 85°, with overnight lows between 46° and 65°. The average high for June is 77° with an average low of 58°. 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 St. Catharines. See also: July | August | September.
