S
M
T
W
T
F
S
28
71°
62°
29
71°
62°
30
86°
66°
1
91°
71°
2
87°
70°
3
87°
72°
4
76°
71°
5
73°
69°
6
70°
60°
7
66°
58°
8
81°
59°
9
83°
69°
10
74°
68°
11
74°
67°
12
75°
65°
13
88°
73°
14
96°
73°
15
90°
68°
16
88°
67°
17
83°
68°
18
78°
64°
19
79°
66°
20
81°
65°
21
79°
64°
22
77°
65°
23
79°
64°
24
81°
65°
25
82°
66°
26
80°
62°
27
79°
65°
28
80°
64°
29
78°
62°
30
78°
66°
31
79°
66°
1
81°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in St. Catharines
St. Catharines's July 2026 forecast shows daily high temperatures ranging from 77° to 96°, with overnight lows between 62° and 73°. The average high for July is 82° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in St. Catharines. See also: August | September | October.
