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
79°
67°
5
79°
64°
6
80°
64°
7
79°
63°
8
87°
69°
9
83°
68°
10
80°
63°
11
80°
65°
12
81°
64°
13
81°
64°
14
80°
66°
15
81°
65°
16
83°
66°
17
81°
64°
18
78°
65°
19
81°
66°
20
77°
59°
21
76°
59°
22
77°
61°
23
78°
63°
24
78°
65°
25
79°
66°
26
77°
66°
27
78°
65°
28
81°
67°
29
83°
67°
30
80°
66°
31
80°
67°
1
82°
66°
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 76° to 87°, with overnight lows between 59° and 69°. The average high for July is 80° with an average low of 65°. 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.
